Fix compatibility with x11-libs/libdrm-2.4.130

Bug: https://bugs.gentoo.org/967246
Upstream PR: https://github.com/ROCm/amdsmi/pull/165
--- a/include/amd_smi/impl/amdgpu_drm.h
+++ b/include/amd_smi/impl/amdgpu_drm.h
@@ -1625,15 +1625,6 @@ struct drm_amdgpu_info_uq_metadata {
 #define AMDGPU_FAMILY_GC_11_5_0			150 /* GC 11.5.0 */
 #define AMDGPU_FAMILY_GC_12_0_0			152 /* GC 12.0.0 */
 
-/* FIXME wrong namespace! */
-struct drm_color_ctm_3x4 {
-	/*
-	 * Conversion matrix with 3x4 dimensions in S31.32 sign-magnitude
-	 * (not two's complement!) format.
-	 */
-	__u64 matrix[12];
-};
-
 #if defined(__cplusplus)
 }
 #endif