samples/boards/nordic: align nrf54h20dk overlay

/delete-property/ for newly added aliases which points to nodes
already removed in that overlay.

Signed-off-by: Andrzej Puzdrowski <[email protected]>

Author: nvlsianpu

samples/boards/nordic/spis_wakeup/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -12,6 +12,8 @@
 		/delete-property/ sw1;
 		/delete-property/ sw2;
 		/delete-property/ sw3;
+		/delete-property/ mcuboot-led0;
+		/delete-property/ mcuboot-button0;
 	};
 	/delete-node/ buttons;
 };