Add sepolicy for aidl bt extension hal

Bug: 274906319
Test: make sepolicy and manual test
Change-Id: I6aa9ebe87c743ceb09067a581f64f6cdc0b7d335
diff --git a/raven-sepolicy.mk b/raven-sepolicy.mk
new file mode 100644
index 0000000..91d85cd
--- /dev/null
+++ b/raven-sepolicy.mk
@@ -0,0 +1,2 @@
+# Ravne only sepolicy
+BOARD_SEPOLICY_DIRS += device/google/gs101-sepolicy/raven