samples: net: pkt_filter: Add Ethernet support to prj.conf

As the sample uses VLAN which needs Ethernet support make sure
CONFIG_NET_L2_ETHERNET is set in prj.conf file.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

samples/net/pkt_filter/prj.conf

@@ -6,6 +6,7 @@ CONFIG_NET_IPV4=y
 CONFIG_NET_DHCPV4=n
 CONFIG_NET_UDP=y
 CONFIG_NET_TCP=y
+CONFIG_NET_L2_ETHERNET=y
 
 # Enable packet filtering
 CONFIG_NET_PKT_FILTER=y