drm/amdgpu: Extends amdgpu vm definitions (v2)

Add RW mtype introduced for arcturus.

v2:
* Don't add probe-invalidation bit from UAPI
* Don't add unused AMDGPU_MTYPE_ definitions

Signed-off-by: Oak Zeng <[e-mail]>
Signed-off-by: Felix Kuehling <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Reviewed-by: Shaoyun Liu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

include/uapi/drm/amdgpu_drm.h

···
 #define AMDGPU_VM_MTYPE_CC		(3 << 5)
 /* Use UC MTYPE instead of default MTYPE */
 #define AMDGPU_VM_MTYPE_UC		(4 << 5)
+/* Use RW MTYPE instead of default MTYPE */
+#define AMDGPU_VM_MTYPE_RW		(5 << 5)
 
 struct drm_amdgpu_gem_va {
 	/** GEM object handle */