i2c: busses: i2c-nomadik: Fix formatting issue pertaining to 'timeout'

Fixes the following W=1 kernel build warning(s):

 drivers/i2c/busses/i2c-nomadik.c:184: warning: Function parameter or member 'timeout' not described in 'nmk_i2c_dev'
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-nomadik.c

@@ -159,7 +159,7 @@ struct i2c_nmk_client {
  * @clk_freq: clock frequency for the operation mode
  * @tft: Tx FIFO Threshold in bytes
  * @rft: Rx FIFO Threshold in bytes
- * @timeout Slave response timeout (ms)
+ * @timeout: Slave response timeout (ms)
  * @sm: speed mode
  * @stop: stop condition.
  * @xfer_complete: acknowledge completion for a I2C message.