msm8996: enable i2c bus 6 for eeprom

Add a eeprom device that contains configuration data used by the
QBT 1000 fingerprint sensor
- enable i2c bus 6
- add AT24 eeprom device on i2c bus 6, slave address 51

CRs-Fixed: 906702
Change-Id: I3d40480140e727c5026e8941bdc8355613756ed1
Signed-off-by: Raj Kumar <kumarra@codeaurora.org>
Signed-off-by: Ian Maund <imaund@codeaurora.org>