MLK-17090: drm/mxsfb: Update mxsfb with additional pixel formats

MLK-17090: drm/mxsfb: Update mxsfb with additional pixel formats

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.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>