htc: m7: allow m7spr and m7vzw to use their own radio blobs.

Change-Id: Id7da454760d7d3500ecea7ea62d768175a1d0247
htc: m7spr: update radio blobs to RUU 3.04

Change-Id: I93e6a5c79918ce9427508199eebce872ef3e54f3