samples: radio_test: remove 'nordic,access' property

It is not needed with IronSide as memory map is flat (for now).

Ref: NCSDK-NONE
Signed-off-by: Håkon Amundsen <[email protected]>

Author: hakonfam

samples/peripheral/radio_test/boards/nrf54h20dk_nrf54h20_cpurad.overlay

@@ -22,7 +22,6 @@
 /* Take Application's DMA region, which is larger and unused. */
 cpurad_dma_region_alt: &cpuapp_dma_region {
 	status = "okay";
-	nordic,access = <NRF_OWNER_ID_RADIOCORE NRF_PERM_RW>;
 };
 
 &uart136 {