d2: Disable entropy gathering for MMC device

 * Flash devices aren't a good source of entropy and contributing to the
   pool can be an expensive operation requiring needless locking.

Change-Id: I6073b38476706c2e678ecf980ca0a1546cda9125
Revert "Tweak Wifi Power Usage/7 Step Call Volume (Credit BMc08GT)"

This reverts commit 0b21c1ddd50677314bb46e0b9a36105f535237ba.
Remove D2 Recovery Stuff/Reimplement 7 Step Call Volume