s390/cio: fix kernel-doc markups in cio driver.

Fix typo in the kernel-doc markups
	1. ccw driver -> ccw_driver
	2. ccw_device_id_is_equal() -> ccw_dev_id_is_equal

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[vneethv@linux.ibm.com: slight modification in the changelog]
Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>