Add function to support getting voltage from device-tree.
If voltage-range is specified in device-tree node, this function
will parse it and return the available voltage mask.
Signed-off-by: NHaijun Zhang <haijun.zhang@freescale.com>
Acked-by: NAnton Vorontsov <anton@enomsg.org>
Signed-off-by: NChris Ball <cjb@laptop.org>