This patch added the id argument for setting the address flags in
pm_nl_ctl.

Usage:

    pm_nl_ctl set id 1 flags backup
Signed-off-by: NGeliang Tang <geliang.tang@suse.com>
Signed-off-by: NMat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>