P2P: Updates the P2P peer list when there is P2P State Change Action

In the current implementation the P2P window gets updated with the
Peers list only when there is WIFI_P2P_PEERS_CHANGED_ACTION Intent.
Thus the P2P status remains unchanged when there is
WIFI_P2P_STATE_CHANGED_ACTION intent. When there is back and forth
navigation to P2P window, WIFI_P2P_STATE_CHANGED_ACTION intent invokes
the onPeersAvaliable function asynchronously and updates the P2P status
and peers list.

CRs-fixed: 512821
Change-Id: I69b26ef72bf30f547bf8fb5580d440c5119df054
(cherry picked from commit 17edb35f25b01560a2fd8c159432a794c46765f0)
(cherry picked from commit f4a4708e50657c14412a9f370f023fd89cba8e6b)