meta-ibm: phosphor-networkd: Remove autotools specific config

We want to use packageconfig options instead of build system specific
ones.

Change-Id: I587d33e3dae82c4c9d85f59f4ee34618443f1dcb
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-ibm/recipes-phosphor/network/phosphor-network_%.bbappend b/meta-ibm/recipes-phosphor/network/phosphor-network_%.bbappend
index cf88f22..a79dae6 100644
--- a/meta-ibm/recipes-phosphor/network/phosphor-network_%.bbappend
+++ b/meta-ibm/recipes-phosphor/network/phosphor-network_%.bbappend
@@ -4,7 +4,7 @@
 SYSTEMD_SERVICE_${PN} += " ncsi-netlink.service"
 FILES_${PN} += "${datadir}/network/*.json"
 
-EXTRA_OECONF += "--enable-sync-mac"
+PACKAGECONFIG_append = " sync-mac"
 
 install_network_configuration(){
     install -d ${D}${systemd_system_unitdir}