drm/radeon: rework VCE FW size calculation

Previously we were completely over allocating, fix this
by actually implementing the size calculation.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index a3ca8cd..cb7787f 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -974,6 +974,7 @@
 int vce_v1_0_start(struct radeon_device *rdev);
 
 /* vce v2.0 */
+unsigned vce_v2_0_bo_size(struct radeon_device *rdev);
 int vce_v2_0_resume(struct radeon_device *rdev);
 
 #endif