Revert "Disable Wifi Direct for now"

This reverts commit fc05430157703e9d042fa8172aaa8ed16eb3aba4.
Reduce size of wpa_supplicant.conf

If the file is big, WifiHW don't generate the config files.

Change-Id: Ic820b24d3e74ae93b5056be12958e9c667a1122c