Explicit init .rc user.

Set the user explicitly.

Bug: 276813155
Test: boot
Change-Id: I4d16b5b6ac8c0403b82992411beb1f567fdb5119
diff --git a/cmds/installd/installd.rc b/cmds/installd/installd.rc
index 5b08c77..525f0c8 100644
--- a/cmds/installd/installd.rc
+++ b/cmds/installd/installd.rc
@@ -1,6 +1,7 @@
 
 service installd /system/bin/installd
     class main
+    user root
     capabilities CHOWN DAC_OVERRIDE DAC_READ_SEARCH FOWNER FSETID KILL SETGID SETUID SYS_ADMIN
 
 on early-boot