p2p: init WifiInjector and WifiPermissionsUtil in WifiP2pServiceImp constructor

Purpose: Reduce code

WifiInjector will init by WifiService and WifiService is init before
WifiP2pService in SystemServer

Bug: 118384508
Test: local ACTS test to verify p2p function
Test: local test APK to test permission
Change-Id: I98bb7b19279d03348d67e1285bb51f5631ccbdcf
1 file changed