samples: net: wifi: Enable inventek es-WIFI shield tests

The es-WIFI driver is used by Inventek's es-WIFI shields. This enables
wifi sample to build all variations to ensures that dependencies are
meet.

Signed-off-by: Gerson Fernando Budke <gerson.budke@atl-electronics.com>

samples/net/wifi/sample.yaml

@@ -13,3 +13,9 @@ tests:
   sample.net.wifi.esp_8266_arduino:
     extra_args: SHIELD=esp_8266_arduino
     platform_allow: frdm_k64f disco_l475_iot1
+  sample.net.wifi.inventek_eswifi_arduino_uart:
+    extra_args: SHIELD=inventek_eswifi_arduino_uart
+    platform_allow: frdm_k64f nucleo_f767zi
+  sample.net.wifi.inventek_eswifi_arduino_spi:
+    extra_args: SHIELD=inventek_eswifi_arduino_spi
+    platform_allow: frdm_k64f nucleo_f767zi