dt-bindings: pinctrl: qcom-pmic-gpio: Add pmx55 support

Add support for the PMX55 GPIO support to the Qualcomm PMIC GPIO
binding.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20201126092151.1082697-1-vkoul@kernel.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt

@@ -29,6 +29,7 @@ PMIC's from Qualcomm.
 		    "qcom,pm8150b-gpio"
 		    "qcom,pm6150-gpio"
 		    "qcom,pm6150l-gpio"
+		    "qcom,pmx55-gpio"
 
 		    And must contain either "qcom,spmi-gpio" or "qcom,ssbi-gpio"
 		    if the device is on an spmi bus or an ssbi bus respectively
@@ -110,6 +111,8 @@ to specify in a pin configuration subnode:
 		    gpio1-gpio12 for pm8150l (hole on gpio7)
 		    gpio1-gpio10 for pm6150
 		    gpio1-gpio12 for pm6150l
+		    gpio1-gpio11 for pmx55 (holes on gpio3, gpio7, gpio10
+					    and gpio11)
 
 - function:
 	Usage: required