mfd: Fix value of WM8994_CONFIGURE_GPIO

This needs to be an out of band value for the register and on this device
registers are 16 bit so we must shift left one to the 17th bit.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>