Cameraserver: Remove unneeded groups

The cameraserver doesn't need access to media, drm, etc, to
operate.

Leave drmrpc as it is required for JPEG encoding support on some
devices.

Bug: 28915212
Change-Id: I61c96739eafbb3e55be7e646390d74bd5e71a842
diff --git a/camera/cameraserver/cameraserver.rc b/camera/cameraserver/cameraserver.rc
index 8f6737f..c1dad2c 100644
--- a/camera/cameraserver/cameraserver.rc
+++ b/camera/cameraserver/cameraserver.rc
@@ -1,7 +1,7 @@
 service cameraserver /system/bin/cameraserver
     class main
     user cameraserver
-    group audio camera input drmrpc inet media mediadrm net_bt net_bt_admin net_bw_acct
+    group audio camera input drmrpc
     ioprio rt 4
     writepid /dev/cpuset/camera-daemon/tasks
     writepid /dev/stune/top-app/tasks