The baseboard of the Logic PD Torpedo development kit has a socket
for a rechargable battery.  The battery is monitored by a charger
which can communicate of the the 1-wire HDQ pin.

This patch enables the pinmux for the HDQ pin.
Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>