test: allow testing with NET_LWIP=y

Adjust network tests to run with CONFIG_NET_LWIP=y.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/test/py/tests/test_fpga.py b/test/py/tests/test_fpga.py
index 74cd42b..299a865 100644
--- a/test/py/tests/test_fpga.py
+++ b/test/py/tests/test_fpga.py
@@ -506,7 +506,7 @@
 @pytest.mark.buildconfigspec('cmd_fpga_load_secure')
 @pytest.mark.buildconfigspec('cmd_net')
 @pytest.mark.buildconfigspec('cmd_dhcp')
-@pytest.mark.buildconfigspec('net')
+@pytest.mark.buildconfigspec('net', 'net_lwip')
 def test_fpga_secure_bit_auth(ubman):
 
     test_net.test_net_dhcp(ubman)
@@ -534,7 +534,7 @@
 @pytest.mark.buildconfigspec('cmd_fpga_load_secure')
 @pytest.mark.buildconfigspec('cmd_net')
 @pytest.mark.buildconfigspec('cmd_dhcp')
-@pytest.mark.buildconfigspec('net')
+@pytest.mark.buildconfigspec('net', 'net_lwip')
 def test_fpga_secure_bit_img_auth_kup(ubman):
 
     test_net.test_net_dhcp(ubman)