pinctrl: qcom: spmi-gpio: add support for PM*8350* PMIC variants

Add support for qcom,pm8350-gpio, qcom,pm8350b-gpio,
qcom,pm8350c-gpio, and qcom,pmk8350-gpio variants.

Change-Id: I9f914a4e0c54997665bff8372f7fd2c57efccf14
Signed-off-by: David Collins <collinsd@codeaurora.org>