add back xposed

Change-Id: I7b12601ebcb9db306e638d84481fbf50c500fcfc
Signed-off-by: scott <scott@ubuntu>
Preserve Xposed Framework Files

This will Preserve Xposed Framework Files (/system/bin/app_process) while installing so that users dont have to reinstall it everytime they flash a nightly.

Change-Id: I221e64236f93d498042fc6dd0b5852200bf4a379