drm: mxsfb: Merge mxsfb_set_pixel_fmt() and mxsfb_set_bus_fmt()

The mxsfb_set_pixel_fmt() and mxsfb_set_bus_fmt() functions both deal
with format configuration, are always called in a row from
mxsfb_crtc_mode_set_nofb(), and set fields from the LCDC_CTRL register.
This requires a read-modify-update cycle in mxsfb_set_bus_fmt(). Make
this more efficient by merging them together.

Signed-off-by: Laurent Pinchart <[email protected]>
Reviewed-by: Stefan Agner <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Signed-off-by: Stefan Agner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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