ARM: mx53: Fix the chip select addresses

MX53 has 4 chip selects (CS0 - CS3) and the valid combinations are:

- CS0 (128MB)
- CS0 (64MB), CS1 (64MB)
- CS0 (64MB), CS1 (32MB), CS2 (32MB)
- CS0 (32MB), CS1 (32MB), CS2 (32MB) , CS3 (32MB)

Fix these addresses and also take into account all the four possibilities.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>