Fix issue #25289999: Lower device idle alarm limit to 10 mins.

This helps with some cases where perisistent network connections
need a more frequent keep alive signal.  Actually make it 9
minutes to ensure that things needing a 10 minute cycle will
execute within that time.

Change-Id: Ife8c7b7f7f82b108d5a6c1624bd6115e6087c3be