powerpc/t1023rdb: add support for T1023RDB RevC

Add support for NOR flash and GPIO/I2C switch control on RevC.
- NOR support
- bank0/bank4 switch
- SD/eMMC switch
- board version

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
5 files changed