hvcs: Synchronize hotplug remove with port free

Synchronizes hotplug remove with the freeing of the port.
This ensures we have freed all the memory associated with
this port and are not leaking memory.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20230203155802.404324-6-brking@linux.vnet.ibm.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>