Fix include path for system/bt

BUG: 196026708
Test: TH
Merged-In: I0b15d951efb092506173a0c128a1ab933318cba0
Change-Id: Ib68262a0930f006694ebacbe7f78ac38a5c993bb
diff --git a/sl4n/Android.bp b/sl4n/Android.bp
index 5a98d03..8030b2d 100644
--- a/sl4n/Android.bp
+++ b/sl4n/Android.bp
@@ -14,7 +14,7 @@
         "libbluetooth_headers",
     ],
     include_dirs: [
-        "system/bt",
+        "packages/modules/Bluetooth/system",
     ],
     local_include_dirs: [
         "rapidjson/include",