applications: machine_learning: Fix nRF54H20 partition addresses

The nRF54H20 DTS overlay for cpuapp target was missing the
compatible = "zephyr,mapped=partition" which resulted in zephyr soc.c
hook address calculation falling back to DT_FIXED_PARTITION_ADDR which
adds the MRAM base address twice as the
mram1x_controller/mram1x/partitions ranges chain already resolves
DT_REG_ADDR(...) to the absolute address. This caused a BUSFAULT
at the soc_late_init_hook when cpuapp tried to read the RAD reset
vector.

This fix corrects the missing "compatible" in the cpuapp DTS overlay
resulting in correct address calculation.

Ref. NCSDK-38422

Signed-off-by: Michał Grochala <michal.grochala@nordicsemi.no>

Author: grochu

applications/machine_learning/configuration/nrf54h20dk_nrf54h20_cpuapp/app.overlay

@@ -67,10 +67,12 @@ ipc1: &cpuapp_cpuppr_ipc {
 &mram1x {
 	partitions {
 		slot0_partition: cpuapp_slot0_partition: partition@30000 {
+			compatible = "zephyr,mapped-partition";
 			reg = <0x30000 0x82000>;
 		};
 
 		cpurad_slot0_partition: partition@b2000 {
+			compatible = "zephyr,mapped-partition";
 			reg = <0xb2000 0x32000>;
 		};
 	};