net: qrtr: Add dynamic node id configuration

Add support to configure the node id through defconfig. This is useful
for targets that are unable to configure the node id through qrtr-ns
because of security reasons. The local node id can still be overridden
by the ns if it is capable.

Change-Id: Ie9fec2ae276948340f4f5a7e0374d554502a0ee1
Signed-off-by: Chris Lew <clew@codeaurora.org>