sepolicy: Clean up policy for N

Change-Id: I39ddec0f60a9995de13b82f09705d246d7e0f454
diff --git a/sepolicy/installd.te b/sepolicy/installd.te
index 65f471a..47f0c52 100644
--- a/sepolicy/installd.te
+++ b/sepolicy/installd.te
@@ -1,3 +1,3 @@
 # Allow querying of asec size on SD card
-allow installd sdcard_external:dir { search };
-allow installd sdcard_external:file { getattr };
+allow installd sdcard_type:dir { search };
+allow installd sdcard_type:file { getattr };