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

In the current implementation of JBMR2 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.
Here the changes are imported from JBMR1. 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