i2c: fsi: Fix the port number field in status register

The port number field in the status register was not correct, so fix it.

Fixes: d6ffb630 ("i2c: Add FSI-attached I2C master algorithm")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Wolfram Sang <wsa@kernel.org>