drm/msm: bigger synchronization hammer

Because we use a list_head in the bo to track it's position in a submit,
we need to serialize at a higher layer.  Otherwise there are problems
when multiple contexts are SUBMIT'ing in parallel cmdstreams referencing
a shared bo.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --cc drivers/gpu/drm/msm/msm_gem_submit.c
Simple merge

diff --cc drivers/gpu/drm/msm/msm_gpu.c
Simple merge