Revert "drm/radeon/kms: add a new gem_wait ioctl with read/write flags"

This reverts commit d3ed74027f1dd197b7e08247a40d3bf9be1852b0.

Further upstream discussion between Thomas and Marek decided this needed
more work and driver specifics. So revert before it goes upstream.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
index c6c8e43..b07f0f9 100644
--- a/drivers/gpu/drm/radeon/radeon_object.h
+++ b/drivers/gpu/drm/radeon/radeon_object.h
@@ -98,7 +98,7 @@
 }
 
 extern int radeon_bo_wait(struct radeon_bo *bo, u32 *mem_type,
-			  bool no_wait, enum ttm_buffer_usage usage);
+			  bool no_wait);
 
 extern int radeon_bo_create(struct radeon_device *rdev,
 				unsigned long size, int byte_align,