[media] s5p-fimc: Simplify locking by removing the context data structure spinlock

Access to the memory-to-memory video node is serialized through a
mutex so now there is no point in having per device context structure
spinlock.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/media/video/s5p-fimc/fimc-capture.c
Simple merge

diff --cc drivers/media/video/s5p-fimc/fimc-core.c
Simple merge

diff --cc drivers/media/video/s5p-fimc/fimc-core.h
Simple merge