ARM STM/i.MX: Add possibility to choose the bit per pixel for STM video driver
When describing an new video interface, it is now possible to select
the bit per pixel. If nothing is chosen 16bpp is selected by default.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>