xen/events: add xen_evtchn_mask_all()
xen/events: add xen_evtchn_mask_all()

Signed-off-by: David Vrabel <b9d45bd1f671e508cd8daa63dfc3cabb597562df@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <da3a51b335cef0eb0e2c329c5ef6bcd6acef687a@oracle.com>
Reviewed-by: Boris Ostrovsky <b41c17b861974b03cec38e3ec2992769b9bfae55@oracle.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs