Allow widevine drm hal to access allocator hal

This fixes failing vts drm tests

bug:67675811

Change-Id: Ic489b4cfac383e809f9c1f0503c337dce21a100e
diff --git a/sepolicy/vendor/hal_drm_widevine.te b/sepolicy/vendor/hal_drm_widevine.te
index 46abf78..da90b82 100644
--- a/sepolicy/vendor/hal_drm_widevine.te
+++ b/sepolicy/vendor/hal_drm_widevine.te
@@ -21,3 +21,5 @@
 typeattribute hal_drm_widevine data_between_core_and_vendor_violators;
 allow hal_drm_widevine media_data_file:dir create_dir_perms;
 allow hal_drm_widevine media_data_file:file create_file_perms;
+
+allow hal_drm_widevine hal_allocator_server:fd use;