m7-common: improve common proprietary file handling

Change-Id: Idc8eca69e87fa873dfdd3d21e35a9b6ba9ea16ae
m7-common: update guard for m7 variants

Change-Id: I7cb1fa8d9989faf447888691ba84435140e20554
m7-common: nfc: build NFC HAL

Change-Id: I3e0b874cb6a541556c2d24c68db1b25c67f13a6c