samples: wifi: Add scan only in yaml

Add SB_CONFIG_WIFI_NRF70_SCAN_ONLY for SHIELD
nrf7002ek_nrf7000.

Signed-off-by: Kapil Bhatt <kapil.bhatt@nordicsemi.no>

Author: kapbh

samples/wifi/shell/sample.yaml

@@ -54,6 +54,7 @@ tests:
     extra_args:
       - SHIELD=nrf7002ek_nrf7000
       - CONFIG_WIFI_NM_WPA_SUPPLICANT=n
+      - SB_CONFIG_WIFI_NRF70_SCAN_ONLY=y
     integration_platforms:
       - nrf5340dk/nrf5340/cpuapp
       - nrf52840dk/nrf52840