net: qrtr: Add node assignment on new server

The remote processor will not forward a hello packet for the other
processors that it is forwarding from. Discover nodes through
QRTR_TYPE_NEW_SERVER messages as well in order to find remote hosts
which require more than one hop to reach it.

Change-Id: Ia79df1fa2730250786d221fb847029046a53bea4
Signed-off-by: Gustavo Solaira <gustavos@codeaurora.org>
Signed-off-by: Chris Lew <clew@codeaurora.org>