pinctrl: qcom: move ipq4019 driver from mach-ipq40xx

Drop the duplicated pinctrl-snapdragon driver from mach-ipq40xx and add
it to drivers/pinctrl/qcom.

Acked-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>