Revert "Enhance DHCP beyond just OFF and IPv4/IPv6 enabled."

This reverts commit 12162be363f11b9dafa92b5379db671712b3523c.  This was
merged before the implementation was ready.

Change-Id: I27b42623ead7ab43511b8e294f5f5c530dd08834
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/xyz/openbmc_project/Network/EthernetInterface.interface.yaml b/xyz/openbmc_project/Network/EthernetInterface.interface.yaml
index 56285ee..ee54145 100644
--- a/xyz/openbmc_project/Network/EthernetInterface.interface.yaml
+++ b/xyz/openbmc_project/Network/EthernetInterface.interface.yaml
@@ -23,7 +23,7 @@
       description: >
           Domain names of the ethernet interface.
     - name: DHCPEnabled
-      type: enum[self.DHCPConf]
+      type: boolean
       description: >
           Address mode of the ethernet interface.
     - name: Nameservers
@@ -69,11 +69,4 @@
         - name: v4
         - name: v6
         - name: none
-    - name: DHCPConf
-      description: >
-          A list of the permitted DHCP settings used by systemd.
-      values:
-        - name: both
-        - name: v4
-        - name: v6
-        - name: none
+