allow mediaserver to access configstore

This is needed to use graphics RenderEngine, creation will
try to access configstore.

bug: 135717526
test: run MediaMetadataRetrieverTest, there shouldn't be any
avc denials in logcat.

Change-Id: Ie26ffe4844edd52684f254e77d9f515550dc82fb
diff --git a/private/mediaserver.te b/private/mediaserver.te
index 635cf4e..bf8be28 100644
--- a/private/mediaserver.te
+++ b/private/mediaserver.te
@@ -5,6 +5,7 @@
 
 # allocate and use graphic buffers
 hal_client_domain(mediaserver, hal_graphics_allocator)
+hal_client_domain(mediaserver, hal_configstore)
 hal_client_domain(mediaserver, hal_omx)
 hal_client_domain(mediaserver, hal_codec2)