allow mediaserver to access drm hidl

Previously mediaserver could only access hidl via mediadrmserver.
Required because mediadrmserver will be removed in R.

Bug: 134787536
Bug: 144731879
Test: MediaPlayerDrmTest
Change-Id: If0ae1453251e88775a43750e24f7dac198294780
diff --git a/private/mediaserver.te b/private/mediaserver.te
index bf8be28..d74ab95 100644
--- a/private/mediaserver.te
+++ b/private/mediaserver.te
@@ -6,6 +6,7 @@
 # allocate and use graphic buffers
 hal_client_domain(mediaserver, hal_graphics_allocator)
 hal_client_domain(mediaserver, hal_configstore)
+hal_client_domain(mediaserver, hal_drm)
 hal_client_domain(mediaserver, hal_omx)
 hal_client_domain(mediaserver, hal_codec2)