Tsi108 on chip i2c support.

The i2c  Interface provides a master-only, serial interface that can be
used for initializing Tsi108/Tsi109 registers from an EEPROM after a
device reset.

Signed-off-by: Alexandre Bounine <alexandreb@tundra.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>