AOSP_ALL: fix race condition between chronic-config and qcom-post-boot.

When cache/dalvik cache are wiped and boot animation stops before boot
is acutolly completed qucom-psst-boot runs after the config script. This
fixes that by setting the chronic-config.sh script to not be executed
until the boot is actually fully completed.

Change-Id: I37dd37f85cdfc4bda1aaeb75f7aa7d80db2fd787