Add metrics domain for Bluetooth

Bug: 142388279
Test: connect to media device, turn off bluetooth, no denial
Change-Id: I7b593c7881fddd939a83696e58abb562beb65093
(cherry picked from commit fdf9549df588329b7fed09678b7d13c4216bd067)
diff --git a/car_product/sepolicy/private/bluetooth.te b/car_product/sepolicy/private/bluetooth.te
new file mode 100644
index 0000000..6ba74c2
--- /dev/null
+++ b/car_product/sepolicy/private/bluetooth.te
@@ -0,0 +1 @@
+allow bluetooth mediametrics_service:service_manager find;