Robert Chiras authored Aug 21, 2019 and Guido Gunther committed Oct 18, 2019

Since version 4 of eLCDIF, there are some registers that can do
transformations on the input data, like re-arranging the pixel
components. By doing that, we can support more pixel formats.
This patch adds support for X/ABGR and RGBX/A. Although, the local alpha
is not supported by eLCDIF, the alpha pixel formats were added to the
supported pixel formats but it will be ignored. This was necessary since
there are systems (like Android) that requires such pixel formats.

Also, add support for the following pixel formats:
            16 bpp: RG16 ,BG16, XR15, XB15, AR15, AB15

Set the bus format based on input from the user and panel
capabilities.
Save the bus format in crtc->mode.private_flags, so the bridge can
use it.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>