drm/radeon: only save UVD bo when we have open handles

Otherwise just reinitialize from scratch on resume,
and so make it more likely to succeed.

Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --cc drivers/gpu/drm/radeon/cik.c
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon.h
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon_fence.c
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon_uvd.c
Simple merge

diff --cc drivers/gpu/drm/radeon/rv770.c
Simple merge