media: v4l2-common: Add helpers to calculate bytesperline and sizeimage

Add helper functions to calculate plane bytesperline and sizeimage,
these new helpers consider bpp div, block width and height when
calculating plane bytesperline and sizeimage.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-by: Christopher Obbard <chris.obbard@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>