Add support for VK_EXT_blend_operation_advanced to the Honeykrisp
Vulkan driver. Extend agx_blend_rt_key with a tagged mode field
interpreted via pack/unpack helpers for standard and advanced blend
state.
The driver advertises full extension support including all operations,
independent blend, non-premultiplied colors, and correlated overlap.
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38929>