Fix recovery flags

Change-Id: I97ddda54f4ae0a606f85383ebadb5126a8d27018
init_falcon: Add props for falcon_gpe

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

Change-Id: I9fc2b3fa2a9f9d1a78a10ed6a4d13a6dacfe85f0