m7: split extract script into extracter, makefile writer

Change-Id: I06a55d5d3b0f402ae693d6f28a8ea5f8cef207c3
m7: update proprietary-files.txt for nfc props.

Change-Id: Icedefea6e6be535ae054845bed8864fe4b052ee4
m7: don't use prebuilt libril

Change-Id: I095ed707c6c81593438e4ba53d8bd133bdd20bbb