fix #5160: fix move_mount regression for mount point hotplug

fix #5160: fix move_mount regression for mount point hotplug

Set up an Apparmor profile to allow moving mounts for mount point
hotplug.

This fixes a regression caused by
kernel commit 157a3537d6 ("apparmor: Fix regression in mount mediation")

The commit introduced move_mount mediation, which now requires
move_mount to be allowed in the Apparmor profile. Although it is allowed
for most paths in the /usr/bin/lxc-start profile, move_mount is called
with a file descriptor instead of a path in mountpoint_insert_staged,
thus it is not affected by the allow rules in
/etc/apparmor.d/abstractions/lxc/container-base.

To fix this, introduce a new Apparmor profile to allow move_mount on
every mount, specifically for mount point hotplug.

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>