samples: net: dhcpv4: Add net-shell and e1000 driver support

The dhcpv4-client is more usable if it has net-shell. For testing
with qemu_x86, the e1000 overlay config is very useful.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
diff --git a/samples/net/dhcpv4_client/overlay-e1000.conf b/samples/net/dhcpv4_client/overlay-e1000.conf
new file mode 100644
index 0000000..cb5be85
--- /dev/null
+++ b/samples/net/dhcpv4_client/overlay-e1000.conf
@@ -0,0 +1,9 @@
+CONFIG_NET_L2_ETHERNET=y
+CONFIG_NET_QEMU_ETHERNET=y
+
+CONFIG_ETH_E1000=y
+
+CONFIG_PCI_ENUMERATION=y
+CONFIG_PCI=y
+
+#CONFIG_ETHERNET_LOG_LEVEL_DBG=y
diff --git a/samples/net/dhcpv4_client/prj.conf b/samples/net/dhcpv4_client/prj.conf
index ac865ef..1be69e9 100644
--- a/samples/net/dhcpv4_client/prj.conf
+++ b/samples/net/dhcpv4_client/prj.conf
@@ -16,3 +16,4 @@
 CONFIG_LOG=y
 
 CONFIG_SLIP_STATISTICS=n
+CONFIG_NET_SHELL=y