i2c: Add driver for Cadence I2C controller

Add a driver for the Cadence I2C controller. This controller is for
example found in Xilinx Zynq.

Signed-off-by: Soren Brinkmann <[email protected]>
Tested-by: Michal Simek <[email protected]>
Reviewed-by: Harini Katakam <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
4 files changed