UPSTREAM: media: Add Y012 video format

Y012 is a luma-only formats with 12-bits per pixel,
expanded to 16bits.
Data in the 12 high bits, zeros in the 4 low bits,
arranged in little endian order.

Bug: 293213303
Change-Id: I1a8f73162932e0760aabbe44525d7c74ace9f7bd
(cherry picked from commit a490ea68)
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Jindong Yue <jindong.yue@nxp.com>