Allow SystemSuspend to call Bluetooth via binder

This allows the SystemSuspend to serve Bluetooth registered callbacks
for BTAA purpose.

Test: Local test verified registered callbacks been serviced
Bug: 170315554
Change-Id: I358b6732fdb663dcffd2647b6d6fa9727be5564e
diff --git a/private/system_suspend.te b/private/system_suspend.te
index 4cd3ec9..9f6d7af 100644
--- a/private/system_suspend.te
+++ b/private/system_suspend.te
@@ -16,6 +16,9 @@
 # To resolve arbitrary sysfs paths from /sys/class/wakeup/* symlinks.
 allow system_suspend sysfs_type:dir search;
 
+# To call BTAA registered callbacks
+allow system_suspend bluetooth:binder call;
+
 neverallow {
     domain
     -atrace # tracing