pipe-loader,gallium/drm: Fix the kmsro pipe_loader target

Include drm_helper.h to define the driver descriptor again, but with a
new define GALLIUM_KMSRO_ONLY to disable defining descriptors for the
drivers that kmsro uses.

Fixes clinfo on Panfrost.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4002
Fixes: 9ec28b8d22 ("gallium/drm: Deduplicate screen creation for the dynamic (clover) pipe loader.")
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9380>
(cherry picked from commit 06a883cfe5)

.pick_status.json

@@ -382,7 +382,7 @@
         "description": "pipe-loader,gallium/drm: Fix the kmsro pipe_loader target",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": "9ec28b8d226558aa2748dbf813b125f8938a09cc"
     },

src/gallium/auxiliary/target-helpers/drm_helper.h

@@ -60,6 +60,15 @@ const struct drm_driver_descriptor descriptor_name = {         \
 
 #endif
 
+#ifdef GALLIUM_KMSRO_ONLY
+#undef GALLIUM_V3D
+#undef GALLIUM_VC4
+#undef GALLIUM_FREEDRENO
+#undef GALLIUM_ETNAVIV
+#undef GALLIUM_PANFROST
+#undef GALLIUM_LIMA
+#endif
+
 #ifdef GALLIUM_I915
 #include "i915/drm/i915_drm_public.h"
 #include "i915/i915_public.h"

src/gallium/targets/pipe-loader/pipe_kmsro.c

@@ -2,3 +2,5 @@
 #include "target-helpers/inline_debug_helper.h"
 #include "frontend/drm_driver.h"
 #include "kmsro/drm/kmsro_drm_public.h"
+#define GALLIUM_KMSRO_ONLY
+#include "target-helpers/drm_helper.h"