SE Policy for Tether Offload HAL

Update SE Policy to allow calls to and callbacks for the Tether Offload HAL
HIDL binderized service.

Bug: 38417260
Test: New functionality. So we don't have any tests.
Change-Id: I2c95b290523c55c081afa1bca091f368559c9125
(cherry picked from commit 722249b3e83dba446a93ace95d211f874c424737)
diff --git a/private/system_server.te b/private/system_server.te
index 6341017..cf93702 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -186,6 +186,7 @@
 allow system_server hidl_token_hwservice:hwservice_manager find;
 hal_client_domain(system_server, hal_power)
 hal_client_domain(system_server, hal_sensors)
+hal_client_domain(system_server, hal_tetheroffload)
 hal_client_domain(system_server, hal_thermal)
 hal_client_domain(system_server, hal_tv_cec)
 hal_client_domain(system_server, hal_tv_input)