mach-ipq40xx: import GPIO header from mach-snapgradon

Pinctrl driver was refactored and moved, but the required header that
it depends on was not included.

Fixes: 24d2908e ("pinctrl: qcom: move ipq4019 driver from mach-ipq40xx")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>