drm/radeon: allow selection of alignment in the sub-allocator

commit 6c4f978b357bc779c703fda1f200e9179623d3e9 upstream.

There are cases where we need more than 4k alignment.  No
functional change with this commit.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 142ce6c..f4dcfdd 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -408,6 +408,7 @@
 	uint64_t		gpu_addr;
 	void			*cpu_ptr;
 	uint32_t		domain;
+	uint32_t		align;
 };
 
 struct radeon_sa_bo;