i2c-c2k: Handle i2c transfers like a standard driver

The i2c-c2k driver doesn't implement read and write transfers as raw
transfers, instead it behaves like i2c_read/write_reg() and messes
with the message buffer. Remove this weird handling and make it behave
like a standard driver.

Change-Id: Id16f5a9fbc9d514c5801feb528237af4b9866136
1 file changed