xen/evtchn: modify evtchn_alloc_unbound to allocate specified port

xen/evtchn: modify evtchn_alloc_unbound to allocate specified port

Currently evtchn_alloc_unbound() always allocates the next available
port. Static event channel support for dom0less domains requires
allocating a specified port.

Modify the evtchn_alloc_unbound() to accept the port number as an
argument and allocate the specified port if available. If the port
number argument is zero, the next available port will be allocated.

Signed-off-by: Rahul Singh <rahul.singh@arm.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>