Revert "libdrm: Add coherent flag to set_tiling"

This reverts commit c6544430c3f9019f7043d8f1684bd30a69749dc4.

Will be replaced with a new, revised interface.
diff --git a/include/drm/nouveau_drm.h b/include/drm/nouveau_drm.h
index 7ee8355..362825a 100644
--- a/include/drm/nouveau_drm.h
+++ b/include/drm/nouveau_drm.h
@@ -102,9 +102,6 @@
 #define NOUVEAU_GEM_TILE_32BPP       0x00000002
 #define NOUVEAU_GEM_TILE_ZETA        0x00000004
 #define NOUVEAU_GEM_TILE_NONCONTIG   0x00000008
-/* Tile flags mask in tile_flags field. */
-#define NOUVEAU_GEM_TILE_MASK        0x3ffff
-#define NOUVEAU_GEM_FLAGS_COHERENT   (1U << 31)
 
 struct drm_nouveau_gem_info {
 	uint32_t handle;
@@ -119,7 +116,6 @@
 struct drm_nouveau_gem_set_tiling {
 	uint32_t handle;
 	uint32_t tile_mode;
-	/* Logic OR of NOUVEAU_GEM_TILE_* and NOUVEAU_GEM_FLAGS_*. */
 	uint32_t tile_flags;
 };