p506: Copy bluetooth vendor config

The bt_vendor.conf file is needed by every device,altough it's built only for certain devices (crespo,grouper,maguro etc). Using a prebuilt one is needed.

Change-Id: I92e5337631555da656dd2e5f6f6d3940b71e9902
Fix common include priority for p506

PRODUCT_COPY_FILES: First definition wins if the file name is the same. Most specific first.
DEVICE_PACKAGE_OVERLAYS: Last definition wins. Most specific last.
CONFIG := xxx: Last definition wins. Most specific last.

TESTED ON: configs/wpa_supplicant.conf

Change-Id: I8c5edf4fb9c4d7667fc9bb98043a971bbf5d4a39
p506: Use tiny config

Change-Id: I1c903af73805fa10da3aad8749ccb3f75e563ecb