net: qrtr: avoid deadlock in case of recursive lock for node list

Qrtr node list lock can be taken recursively by a thread and
in between other thread can contend the same lock for write,
this marks the lock as write biased and results in deadlock.

Changed qrtr code to avoid taking node list lock recursively
and prevent possible deadlock scenario.

CR-Fixed: 2384092
Change-Id: Idcdd1b3dbc8c19867c8afcde40ae4dcf08d87d66
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>