storageproxyd: start storageproxyd as "system" user and group

Bug: 205904330
Test: boot
Change-Id: I7ad81b202e25307e4f49c48e4ae790d0b9ec6801
diff --git a/conf/init.gs101.rc b/conf/init.gs101.rc
index 09ab2e6..6b7fdcc 100644
--- a/conf/init.gs101.rc
+++ b/conf/init.gs101.rc
@@ -827,7 +827,8 @@
 service storageproxyd /vendor/bin/storageproxyd -d /dev/trusty-ipc-dev0 \
         -r /dev/sg1 -p /data/vendor/ss -t ufs
     class early_hal
-    user root
+    user system
+    group system
 
 # Write build info to kdebuginfo
 on property:ro.build.fingerprint=*