ADPF: Allow PowerHAL to set sched

system_server also creates UI sometimes.
Ex: ANR Dialog, the Pointer Location in developer options.

Bug: 194775170
Test: build and enable Pointer Location debug option
Change-Id: Ife50e90d2899623d8a482ca79ae7c74aafae9a49
diff --git a/power-libperfmgr/hal_power_default.te b/power-libperfmgr/hal_power_default.te
index 314bc11..fa23f8b 100644
--- a/power-libperfmgr/hal_power_default.te
+++ b/power-libperfmgr/hal_power_default.te
@@ -13,3 +13,6 @@
 # Set scheduling info for apps (for adpf)
 allow hal_power_default appdomain:process { getsched setsched };
 allow hal_power_default self:capability sys_nice;
+
+# Set scheduling info for system_server (for adpf)
+allow hal_power_default system_server:process setsched;