m7: don't use proprietary libril
m7: use c2d2 libs from jf
m7: remove nfc blob
m7spr: rename from m7wls to m7spr
m7ul: rename from m7 to m7ul
m7: improve common proprietary file handling

Device-specific proprietary files, device-specific but commonly named
proprietary files, and common proprietary files are now handled.