wifi: nrf_wifi: Adjust default heap size for driver init failures

Reconfigure DATA heap sizes to fix the driver init failures.

Signed-off-by: Ravi Dondaputi <ravi.dondaputi@nordicsemi.no>

Author: rado17

drivers/wifi/nrf_wifi/Kconfig.nrfwifi

@@ -542,7 +542,7 @@ config NRF_WIFI_CTRL_HEAP_SIZE
 
 config NRF_WIFI_DATA_HEAP_SIZE
 	int "Dedicated memory pool for data plane"
-	default 6000 if NRF70_SCAN_ONLY
+	default 8000 if NRF70_SCAN_ONLY || NRF70_RADIO_TEST #TODO: Need to optimize this.
 	default 110000 if !SOC_FAMILY_NORDIC_NRF
 	default 130000