i2c-c2k: Don't set the interrupt flag after writing a byte

According to the register manual this flag is supposed to be set by
the controller, not the driver. The Linux driver for this controller
doesn't set the flag. Remove what seems to be just another of the
many hacks in this driver.

Change-Id: Ic63c864e45d7a833f60b81b524ee7e6b62a58f53
1 file changed