powerpc/t1040: update i2c for t1040qds and t104xrdb

- Fix base address of I2C2 as 0x118100 instead of 0x119000.
- Add definitions for I2C3 & I2C4.

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