[media] s5p-fimc: Use consistent names for the buffer list functions

Also correct and improve *_queue_add/pop functions description.

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