upstream: [media] v4l: Rename vb2_queue.timestamp_type as timestamp_flags

upstream: [media] v4l: Rename vb2_queue.timestamp_type as timestamp_flags

The timestamp_type field used to contain only the timestamp type. Soon it
will be used for timestamp source flags as well. Rename the field
accordingly.

[m.chehab@samsung.com: do the change also to drivers/staging/media and at s2255]
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Conflicts:
	drivers/media/platform/mem2mem_testdev.c
	drivers/media/platform/s5p-g2d/g2d.c
	drivers/staging/media/msi3101/sdr-msi3101.c