net: qrtr: Change node discovery mechanism of QRTR

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>