Give google camera on Marlin access to media metrics

On Marlin, the camera gets its own set of sepolicy settings instead of
taking the from system/sepolicy/. I missed this file as a place that
needed access to media metrics (mediametrics_service), probably because
I did most of my work with bullhead instead of marlin.

This fix exposes other issues that appear to be within Treble.

Bug: 35484589
Test: run camera/video-capture -- but only with Treble disabled
Change-Id: I9044abf64ab77e9e021edc1a6de39570362c29a3
diff --git a/sepolicy/google_camera_app.te b/sepolicy/google_camera_app.te
index 66364a0..8ea0372 100644
--- a/sepolicy/google_camera_app.te
+++ b/sepolicy/google_camera_app.te
@@ -10,6 +10,7 @@
 allow google_camera_app mediacodec_service:service_manager find;
 allow google_camera_app mediaextractor_service:service_manager find;
 allow google_camera_app mediaserver_service:service_manager find;
+allow google_camera_app mediametrics_service:service_manager find;
 allow google_camera_app nfc_service:service_manager find;
 allow google_camera_app surfaceflinger_service:service_manager find;