modemloader: Use hw.revision instead of ro.revision

This change requires you to hexedit your cbd binary,
but in turn frees us from having to ignore ro.revision
in init.

Change-Id: I9c43fbbf5895888ea4bceff2a08a5ed8de77b921

modemloader/modemloader.c

@@ -89,7 +89,7 @@ int main(void)
 
     parse_hardware_revision(&revision);
     snprintf(ro_revision, PROP_VALUE_MAX, "%d", revision);
-    property_set("ro.revision", ro_revision);
+    property_set("hw.revision", ro_revision);
 
     return 0;
 }