meta-facebook: more prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I21120d6215c25be49afd60d6e807b68f2798423a
diff --git a/meta-facebook/conf/machine/include/facebook.inc b/meta-facebook/conf/machine/include/facebook.inc
index 33e95af..d18a66b 100644
--- a/meta-facebook/conf/machine/include/facebook.inc
+++ b/meta-facebook/conf/machine/include/facebook.inc
@@ -6,11 +6,11 @@
 
 VIRTUAL-RUNTIME_skeleton_workbook = "${MACHINE}-config"
 
-PREFERRED_PROVIDER:virtual/obmc-chassis-mgmt = "packagegroup-fb-apps"
-PREFERRED_PROVIDER:virtual/obmc-fan-mgmt = "packagegroup-fb-apps"
-PREFERRED_PROVIDER:virtual/obmc-flash-mgmt = "packagegroup-fb-apps"
-PREFERRED_PROVIDER:virtual/obmc-inventory-data ?= "${VIRTUAL-RUNTIME_skeleton_workbook}"
-PREFERRED_PROVIDER:virtual/obmc-system-mgmt = "packagegroup-fb-apps"
+PREFERRED_PROVIDER_virtual/obmc-chassis-mgmt = "packagegroup-fb-apps"
+PREFERRED_PROVIDER_virtual/obmc-fan-mgmt = "packagegroup-fb-apps"
+PREFERRED_PROVIDER_virtual/obmc-flash-mgmt = "packagegroup-fb-apps"
+PREFERRED_PROVIDER_virtual/obmc-inventory-data ?= "${VIRTUAL-RUNTIME_skeleton_workbook}"
+PREFERRED_PROVIDER_virtual/obmc-system-mgmt = "packagegroup-fb-apps"
 
 IMAGE_FEATURES:remove = "obmc-ikvm"