recovery: Always allow the CM release key

Avoid the "Untrusted" warning in recovery when flashing a CM-signed
build

Change-Id: I13900bd7e2539fdc7442477a844391b8c5d87dda
use 4.9 toolchain

Change-Id: I0cb41c0940d7a91b867578a4274da716474c9f6f
Revert "use 4.9 toolchain"

This reverts commit e7a296a2d568bbf26f695c6df1d8d53b2e21ec83.
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_build into jb-mv