[nrf fromlist] boards: nordic: update binding for MX25U

Separate compatible is required for Flash MSPI quirks.

Upstream PR #: 85520

Signed-off-by: Marcin Szymczyk <[email protected]>

Author: masz-nordic

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpuapp.dts

@@ -268,7 +268,7 @@ ipc0: &cpuapp_cpurad_ipc {
 	status = "okay";
 
 	mx25uw63: mx25uw6345g@0 {
-		compatible = "jedec,mspi-nor";
+		compatible = "mxicy,mx25u", "jedec,mspi-nor";
 		status = "disabled";
 		reg = <0>;
 		jedec-id = [c2 84 37];

boards/nordic/nrf9280pdk/nrf9280pdk_nrf9280_cpuapp.dts

@@ -254,7 +254,7 @@ ipc0: &cpuapp_cpurad_ipc {
 	status = "okay";
 
 	mx25uw63: mx25uw6345g@0 {
-		compatible = "jedec,mspi-nor";
+		compatible = "mxicy,mx25u", "jedec,mspi-nor";
 		status = "disabled";
 		reg = <0>;
 		jedec-id = [c2 84 37];