media: Fix incorrect P010 chroma order description

The chroma order of P010 is `CbCr`,
match with the descriptions in `include/uapi/linux/videodev2.h` and the
documentation.

Fixes: 5374d8fb

 ("media: Add P010 video format")
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>