vfio-ccw: make vfio_ccw_regops variables declarations static

Fixes the following sparse warnings:
drivers/s390/cio/vfio_ccw_chp.c:62:30: warning: symbol 'vfio_ccw_schib_region_ops' was not declared. Should it be static?
drivers/s390/cio/vfio_ccw_chp.c:117:30: warning: symbol 'vfio_ccw_crw_region_ops' was not declared. Should it be static?

Link: https://lkml.kernel.org/r/patch.git-a34be7aede18.your-ad-here.call-01591269421-ext-5655@work.hoursReviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/cio/vfio_ccw_chp.c

@@ -59,7 +59,7 @@ static void vfio_ccw_schib_region_release(struct vfio_ccw_private *private,
 
 }
 
-const struct vfio_ccw_regops vfio_ccw_schib_region_ops = {
+static const struct vfio_ccw_regops vfio_ccw_schib_region_ops = {
 	.read = vfio_ccw_schib_region_read,
 	.write = vfio_ccw_schib_region_write,
 	.release = vfio_ccw_schib_region_release,
@@ -131,7 +131,7 @@ static void vfio_ccw_crw_region_release(struct vfio_ccw_private *private,
 
 }
 
-const struct vfio_ccw_regops vfio_ccw_crw_region_ops = {
+static const struct vfio_ccw_regops vfio_ccw_crw_region_ops = {
 	.read = vfio_ccw_crw_region_read,
 	.write = vfio_ccw_crw_region_write,
 	.release = vfio_ccw_crw_region_release,