Run boot HAL service as root

The service must run as root to access block devices required by
the existing implementation.

Test: bootctl is-slot-bootable 1
Change-Id: I882cba8ad24943781d5c447b67518acc03efc9a8
Signed-off-by: Connor O'Brien <connoro@google.com>
diff --git a/boot/1.0/default/android.hardware.boot@1.0-service.rc b/boot/1.0/default/android.hardware.boot@1.0-service.rc
index 57c1aff..67d400b 100644
--- a/boot/1.0/default/android.hardware.boot@1.0-service.rc
+++ b/boot/1.0/default/android.hardware.boot@1.0-service.rc
@@ -1,4 +1,4 @@
 service boot-hal-1-0 /system/bin/hw/android.hardware.boot@1.0-service
     class hal
-    user system
-    group system readproc
+    user root
+    group root