smdk4412-common: Update recovery_keys

Cleanup and update, see: http://review.cyanogenmod.org/62724

Change-Id: Ic7d16dddb56fe7773556572fc0021a00829f6a6c
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_device_samsung_smdk4412-common into cm-11.0