samples: net: dhcpv4_client: Enable DNS in the sample

The DHCP server can distribute DNS addresses, hence enable DNS resolver
in the sample to show this functionality.

Signed-off-by: Robert Lubos <[email protected]>

Author: rlubos

samples/net/dhcpv4_client/prj.conf

@@ -5,6 +5,7 @@ CONFIG_NET_ARP=y
 CONFIG_NET_UDP=y
 CONFIG_NET_DHCPV4=y
 CONFIG_NET_DHCPV4_OPTION_CALLBACKS=y
+CONFIG_DNS_RESOLVER=y
 
 CONFIG_TEST_RANDOM_GENERATOR=y