Put media.metrics service into proper group

specify a group for the media.metrics service.
the unspecified default is inappropriate.

Bug: 65334712
Bug: 65540999
Test: examination of /proc info for metrics
Change-Id: I0e35a2d676586216bcfee672666803b7fa5eae4d
(cherry picked from commit a61dff07b71b6999f30c2a15268d8a4d87d4ce48)
(cherry picked from commit d162b02aefa4d2039f377ba9a45d753cd84d75f6)
diff --git a/services/mediaanalytics/mediametrics.rc b/services/mediaanalytics/mediametrics.rc
index 3829f8c..1efde5e 100644
--- a/services/mediaanalytics/mediametrics.rc
+++ b/services/mediaanalytics/mediametrics.rc
@@ -1,5 +1,6 @@
 service mediametrics /system/bin/mediametrics
     class main
     user media
+    group media
     ioprio rt 4
     writepid /dev/cpuset/foreground/tasks /dev/stune/foreground/tasks