[nrf fromlist] dts: nordic: Add wifi_spi label

Add wifi_spi label to nRF54h and nRF54l dts files to help
in shield overlay files

Upstream PR #: 85481

Signed-off-by: Bansidhar P.M <[email protected]>

Author: bama-nordic

dts/common/nordic/nrf54h20.dtsi

@@ -1003,7 +1003,7 @@
 				zephyr,pm-device-runtime-auto;
 			};
 
-			spi130: spi@9a5000 {
+			wifi_spi: spi130: spi@9a5000 {
 				compatible = "nordic,nrf-spim";
 				reg = <0x9a5000 0x1000>;
 				status = "disabled";

dts/common/nordic/nrf54l_05_10_15.dtsi

@@ -371,7 +371,7 @@
 				zephyr,pm-device-runtime-auto;
 			};
 
-			spi22: spi@c8000 {
+			wifi_spi: spi22: spi@c8000 {
 				/*
 				 * This spi node can be either SPIM or SPIS,
 				 * for the user to pick: