i2c-msm-v2: Separate the kconfig opt for msm i2c drivers

Allow choosing of only one msm i2c driver at a time.
This is required for i2c controller HW supported by
i2c-msm-v2 but not by i2c-qup.
i2c-msm-v2 driver is given its own dedicated kernel config
option, rather than being bundled-up with the i2c_qup driver.

Change-Id: Ib22db2e920de243b1ad5938b8304f838a01140e0
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>