build: Add changes to release tools and mkbootimg

Change the prototype of LoadRecoveryFstab to take in the device type
as a argument. Fix the case where mkbootimg was being passed a incorrect
argument.

Change-Id: Ic6ac596d8d96d3a5effbdf513763ec1cb92b1a03
Merge remote-tracking branch 'cm/cm-12.0' into cm-12.0