drm/ttm: remove unused placement flags

Either never used or not used in quite a while.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

include/drm/ttm/ttm_placement.h

@@ -60,7 +60,6 @@
 #define TTM_PL_FLAG_CACHED      (1 << 16)
 #define TTM_PL_FLAG_UNCACHED    (1 << 17)
 #define TTM_PL_FLAG_WC          (1 << 18)
-#define TTM_PL_FLAG_SHARED      (1 << 20)
 #define TTM_PL_FLAG_NO_EVICT    (1 << 21)
 #define TTM_PL_FLAG_TOPDOWN     (1 << 22)
 
@@ -70,14 +69,4 @@
 
 #define TTM_PL_MASK_MEMTYPE     (TTM_PL_MASK_MEM | TTM_PL_MASK_CACHING)
 
-/*
- * Access flags to be used for CPU- and GPU- mappings.
- * The idea is that the TTM synchronization mechanism will
- * allow concurrent READ access and exclusive write access.
- * Currently GPU- and CPU accesses are exclusive.
- */
-
-#define TTM_ACCESS_READ         (1 << 0)
-#define TTM_ACCESS_WRITE        (1 << 1)
-
 #endif