i2c: designware: Remove needless initializations from i2c_dw_reg_slave()

These struct dw_i2c_dev members are not used in i2c-designware-slave.c
so remove re-initialization of them from i2c_dw_reg_slave().
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-slave.c

@@ -78,13 +78,7 @@ static int i2c_dw_reg_slave(struct i2c_client *slave)
 
 	__i2c_dw_enable(dev);
 
-	dev->cmd_err = 0;
-	dev->msg_write_idx = 0;
-	dev->msg_read_idx = 0;
-	dev->msg_err = 0;
 	dev->status = 0;
-	dev->abort_source = 0;
-	dev->rx_outstanding = 0;
 
 	return 0;
 }