docs: add release notes for 21.0.2

docs/relnotes/21.0.2.rst

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+Mesa 21.0.2 Release Notes / 2021-04-07
+======================================
+
+Mesa 21.0.2 is a bug fix release which fixes bugs found since the 21.0.1 release.
+
+Mesa 21.0.2 implements the OpenGL 4.6 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 4.6. OpenGL
+4.6 is **only** available if requested at context creation.
+Compatibility contexts may report a lower version depending on each driver.
+
+Mesa 21.0.2 implements the Vulkan 1.2 API, but the version reported by
+the apiVersion property of the VkPhysicalDeviceProperties struct
+depends on the particular driver being used.
+
+SHA256 checksum
+---------------
+
+::
+
+    TBD.
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- warning: xnack 'Off' was requested for a processor that does not support it! \[AMD VEGAM with LLVM 12.0.0\]
+- Clover doesn't work for kmsro drivers
+- util cpu detection breaks on 128-core AMD machines
+- ACO error with GCN 1 GPU
+- kmsro advertises EGL_MESA_device_software
+
+
+Changes
+-------
+
+Adrian Ratiu (1):
+
+- docs: docker: minor stale documentation fix
+
+Bas Nieuwenhuizen (1):
+
+- radv: Flush caches for shader read operations.
+
+Boyuan Zhang (1):
+
+- frontend/va/image: add pipe flush for vlVaPutImage
+
+Charmaine Lee (1):
+
+- gallivm: increase size of texture target enum bitfield
+
+Dave Airlie (3):
+
+- lavapipe: fix templated descriptor updates
+- util: rework AMD cpu L3 cache affinity code.
+- drisw: move zink down the list below the sw drivers.
+
+Dylan Baker (9):
+
+- docs: Add 21.0.1 hashes
+- .pick_status.json: Update to 9be24c89c8c298069eaa3ff600ba556b9a4557e9
+- .pick_status.json: Update to 8e43abcd2c29366d77fff804a7845b61fb97ca5c
+- .pick_status.json: Mark 75951a44ee9f25d29865f3dd60cdf3b8ce3f7f0c as backported
+- .pick_status.json: Update to a7c0cf500b335069bfe480c947b26052335f897e
+- .pick_status.json: Update to ee14bec09a92e4363ef916d00d4d9baecfb09fa9
+- .pick_status.json: Update to 3c64c090e0d2250d7ee880550f8cbeac0052c8d9
+- .pick_status.json: Update to fb5615af40a5878b127827f80f4185df63933f34
+- .pick_status.json: Update to 1e0a69afa72c61e5f5841db3e5e7f6bb846a0fab
+
+Erik Faye-Lund (1):
+
+- compiler/glsl: avoid null-pointer deref
+
+Gert Wollny (1):
+
+- r600: don't set an index_bias for indirect draw calls
+
+Icecream95 (2):
+
+- panfrost: Disable early-z when alpha test is used
+- pipe-loader,gallium/drm: Fix the kmsro pipe_loader target
+
+Lionel Landwerlin (1):
+
+- intel/fs/copy_prop: check stride constraints with actual final type
+
+Marek Olšák (2):
+
+- ac/llvm: don't set unsupported xnack options to fix LLVM crashes on gfx6-8
+- radeonsi: disable sparse buffers on gfx7-8
+
+Michel Dänzer (2):
+
+- intel/tools: Use subprocess.Popen to read output directly from a pipe
+- Revert "glsl/test: Don't run whitespace tests in parallel"
+
+Mike Blumenkrantz (5):
+
+- util/set: stop leaking u32 key sets which pass a mem ctx
+- lavapipe: use the passed offset for CmdCopyQueryPoolResults
+- util/bitscan: add u_foreach_bit macros
+- lavapipe: fix CmdCopyQueryPoolResults for partial pipeline statistics queries
+- lavapipe: fix array texture region copies
+
+Pierre-Eric Pelloux-Prayer (3):
+
+- mesa/st: fix lower_tex_src_plane in multiple samplers scenario
+- nir/lower_tex: ignore texture_index if tex_instr has deref src
+- mesa/st: fix st_nir_lower_tex_src_plane arguments
+
+Rhys Perry (1):
+
+- aco: implement image_deref_samples
+
+Simon Ser (3):
+
+- egl: fix software flag in \_eglAddDevice call on DRM
+- egl: only take render nodes into account when listing DRM devices
+- Revert "egl: Don't add hardware device if there is no render node v2."
+
+Tapani Pälli (1):
+
+- iris: clamp PointWidth in 3DSTATE_SF like i965 does
+
+Tony Wasserka (1):
+
+- aco/isel: Don't emit unsupported i16<->f16 conversion opcodes on GFX6/7