meta-bletchley: phosphor-network: enable force-sync-mac option

For Bletchley, the flash is not embedded on the Chassis Controller
Board (CCB), and the phosphor-network is only sync MAC address on first
boot by default, the BMC may use the wrong MAC address after replacing
the CCB.

Enable the force-sync-mac option to ensure that the BMC loads the
correct MAC address from the CCB on every boot.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: Ic55c5a11bea89618c429f855f2791e94e2c17a81
diff --git a/meta-facebook/meta-bletchley/recipes-phosphor/network/phosphor-network_%.bbappend b/meta-facebook/meta-bletchley/recipes-phosphor/network/phosphor-network_%.bbappend
index b91e82f..5950888 100644
--- a/meta-facebook/meta-bletchley/recipes-phosphor/network/phosphor-network_%.bbappend
+++ b/meta-facebook/meta-bletchley/recipes-phosphor/network/phosphor-network_%.bbappend
@@ -1,6 +1,9 @@
 FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 
 PACKAGECONFIG:append = " sync-mac"
+
+EXTRA_OEMESON = "-Dforce-sync-mac=true"
+
 SRC_URI += " \
     file://config.json \
     "