init_falcon: Add props for falcon_gpe

Use install time script to determine if gpe-boot.img needs to be
installed.

Change-Id: I9fc2b3fa2a9f9d1a78a10ed6a4d13a6dacfe85f0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_motorola_falcon into cd-4.4