s390/tape: Fix device driver name

s390/tape: Fix device driver name

Recent cleanups and code consolidations in the s390 tape device driver
renamed files and function namespaces from tape_34xx to tape_3490 to
better reflect the single support of the IBM 3490E device in the
codebase.

These changes also renamed the driver name to tape_3490, which
consequently broke userspace as the sysfs driver path is now
/sys/bus/ccw/drivers/tape_3490/ instead of
/sys/bus/ccw/drivers/tape_34xx/.

Change the device driver name back to tape_34xx to fix userspace.

Fixes: 9872dae6102e ("s390/tape: Rename tape_34xx.c to tape_3490.c")
Reported-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>