Add a new sysprops for toggling game default frame rate

Create a new system property for game default frame
rate. A toggle system setting UI will set
`persist.graphics.game_default_frame_rate.enabled`
via GameMangerService in system_server.

`persist.graphics.game_default_frame_rate.enabled` == 1:
    default frame rate enabled
`persist.graphics.game_default_frame_rate.enabled` == 0:
    default frame rate disabled

Bug: 286084594
Test: m, flash and boots properly on Raven
Change-Id: Iae7ebf39aad6c81475ef3d289d750a818fd4ef79
diff --git a/private/property.te b/private/property.te
index 8be4d01..e1b42a0 100644
--- a/private/property.te
+++ b/private/property.te
@@ -57,6 +57,7 @@
 system_internal_prop(sensors_config_prop)
 system_internal_prop(hypervisor_pvmfw_prop)
 system_internal_prop(hypervisor_virtualizationmanager_prop)
+system_internal_prop(game_manager_config_prop)
 
 # Properties which can't be written outside system
 system_restricted_prop(device_config_virtualization_framework_native_prop)