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/public/hal_tetheroffload.te b/public/hal_tetheroffload.te
new file mode 100644
index 0000000..a4c21fcd
--- /dev/null
+++ b/public/hal_tetheroffload.te
@@ -0,0 +1,3 @@
+## HwBinder IPC from client to server, and callbacks
+binder_call(hal_tetheroffload_client, hal_tetheroffload_server)
+binder_call(hal_tetheroffload_server, hal_tetheroffload_client)