ARM: dts: ifc6410: remove pinctrl defaults from gpio node.

pinctrl defaults are to be setup by there respective device nodes, we
should not do the default setting in a global gpio/pinctrl controller.

Without this patch there would be a conflict between pwrseq pinctrl and
gpio@150 pinctrl and finally resulting in failing to reset BT and WLAN
chips.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>