Merge pull request #27 from kk1fff/b/835255/reenable-pnn-test

Bug 835255 - Add OPL file and enable PNN file.
external/qemu: Support for Signal Strength in emulator

Change-Id: Ia62ef338b64739d50eeb55d33d15227a0047d8d0
Bug 852583: Add --menuconfig to distrib/build-kernel.sh
Bug 852583 - add an additional debug target: bluetooth
Bug 852583 - add goldfish_bt platform device
Bug 852583 - install a bluetooth device by default if not already specified.
Bug 852583 - add goldfish_rfkill platform device