[nrf fromtree] boards: nrf9280pdk: disable IEEE 802.15.4 support

nRF92 series is not supported in the IEEE 802.15.4 stack yet,
so remove it from the board for now.

Signed-off-by: Bernt Johan Damslora <[email protected]>
(cherry picked from commit cb1b569)

Author: bjda

boards/nordic/nrf9280pdk/nrf9280pdk_nrf9280_cpuapp.dts

@@ -24,7 +24,6 @@
 		zephyr,flash = &mram1x;
 		zephyr,sram = &cpuapp_data;
 		zephyr,shell-uart = &uart136;
-		zephyr,ieee802154 = &cpuapp_ieee802154;
 		zephyr,bt-hci = &bt_hci_ipc0;
 		nordic,802154-spinel-ipc = &ipc0;
 		zephyr,entropy = &prng;
@@ -291,10 +290,6 @@ ipc0: &cpuapp_cpurad_ipc {
 	};
 };
 
-&cpuapp_ieee802154 {
-	status = "okay";
-};
-
 zephyr_udc0: &usbhs {
 	status = "okay";
 };