omap4-common: fix wifi/p2p-config

use right config-file for wifi and p2p and enable p2p on the
p2p-interface

Change-Id: I3add89572ebd3d14bd1d56b77702dac7bf64184f

Conflicts:
	root/init.mapphone.rc

	modified:   common.mk
	modified:   prebuilt/bin/wificalcheck.sh
	new file:   prebuilt/etc/wifi/p2p_supplicant_overlay.conf
	modified:   root/init.mapphone.rc