Make suspend_prop system_vendor_config_prop

Bug: 185810834
Test: adb shell getprop suspend.short_suspend_threshold_millis
Change-Id: I270057e5f81b220b7168573b516dd102650f11e1
(cherry picked from commit c171a1d9b68e2993672c70b1feadf002221d5f23)
2 files changed