ARM: dts: qcom: pmx55: align SPMI PMIC Power-on node name with dtschema

Bindings expect Power-on node name to be "pon":

  'power-on@800' do not match any of the regexes
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220828084341.112146-4-krzysztof.kozlowski@linaro.org

arch/arm/boot/dts/qcom-pmx55.dtsi

@@ -16,7 +16,7 @@ pmic@8 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		power-on@800 {
+		pon@800 {
 			compatible = "qcom,pm8916-pon";
 			reg = <0x0800>;