dt-bindings: pinctrl: qcom-pmic-gpio: Add pms405 support

Add support for the PMS405 GPIO support to the Qualcomm PMIC GPIO
binding.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>