arm64: dts: fix regulator property name for wlan pcie endpoint

The property name vddpe-supply is not included in
Documentation/devicetree/bindings/pci/qcom,pcie.txt
nor in the pcie-qcom PCIe Root Complex driver.

This property name was used in an initial patchset for pcie-qcom,
but was renamed in a later revision.

Therefore, the regulator is currently never enabled, leaving us with
unoperational wlan.

Fix this by using the correct regulator property name, so that wlan
comes up correctly.

Fixes: 1c8ca74a2ea1 ("arm64: dts: apq8096-db820c: Enable wlan and bt en pins")
Signed-off-by: NNiklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi

@@ -211,7 +211,7 @@
 			pcie@600000 {
 				status = "okay";
 				perst-gpio = <&msmgpio 35 GPIO_ACTIVE_LOW>;
-				vddpe-supply = <&wlan_en>;
+				vddpe-3v3-supply = <&wlan_en>;
 				vddpe1-supply = <&bt_en>;
 			};