msm: camera: Add support to set i2c freq mode

The eeprom driver can read i2c speed from dts.
Supported modes: "Fast", "Standard" and "Custom"

Change-Id: Ie1fe437b6b6915cac038f5e8bc8a96a6ec35c281
Signed-off-by: Evgeniy Borisov <eborisov@codeaurora.org>