wifi: Use wpa_data_file instead of wifi_vendor_data_file

system/sepolicy already defines wpa_data_file, Use that
instead of wifi_vendor_data_file

Note: wifi_vendor_data_file cannot be removed due to the
dependencies.This shall be taken subsequently.
Change-Id: I916724ed60162b2b32247f07cca9c1a69363c9fb
CRs-Fixed: 2195448