arm: mxs: Add LCDIF registers for i.MX233

Extend the regs-lcdif.h with registers for i.MX233.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>