drm: mxsfb: Use BIT() macro to define register bitfields

Using BIT() is preferred over manual shifts as it's more readable,
handles the 1 << 31 case properly, and avoids other mistakes as shown by
the DEBUG0_HSYNC and DEBUG0_VSYNC bits (that are currently unused). Use
it.

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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