samples: net: Fix typos

Fix typos in board and config names for MQTT and UDP samples.

Signed-off-by: Triveni Danda <[email protected]>

Author: D-Triveni

samples/net/mqtt/sample.yaml

@@ -63,7 +63,7 @@ tests:
       - ci_samples_net
     extra_args:
       - mqtt_SHIELD="nrf7002ek"
-      - mqtt_EXTRA_CONF_FILE=overlay-tls-nrf54l15-nrf70.conf
+      - mqtt_EXTRA_CONF_FILE=overlay-tls-nrf70.conf
   sample.net.mqtt.nrf54l15.wifi:
     sysbuild: true
     build_only: true

samples/net/udp/Kconfig.sysbuild

@@ -7,6 +7,6 @@
 config WIFI_NRF70
 	default y if BOARD_NRF7002DK_NRF5340_CPUAPP_NS || \
 		     BOARD_NRF5340DK_NRF5340_CPUAPP_NS || \
-		     BOARD_NRF53L15DK_NRF54L15_CPUAPP
+		     BOARD_NRF54L15DK_NRF54L15_CPUAPP
 
 source "share/sysbuild/Kconfig"