add delay-wrapper / hijack-wrapper binaries to help w execve errors

Change-Id: I9b9c0909912bed9231db1dad65af53257147307b
common: make sure to unmount primary partitions before fixboot.sh

Change-Id: I3a475a3a41f08901fb912380ed5f607da537062b
motorola/common-omap4: re-add check for "pds" on hijack

Change-Id: I7f1e7655f3b59e1ef735ee2983d73c7c0e59304c
motorola/common-ghost: add binary wrappers for hijack + use common fixboot

Change-Id: I25163b0947fb0e9914abd3265b6740c226026eb4