meta-ibm: prep for new override syntax

Change-Id: I9116ed7260e369136acb39eec15075db2d4dbeba
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-ibm/recipes-phosphor/host/phosphor-host-postd_%.bbappend b/meta-ibm/recipes-phosphor/host/phosphor-host-postd_%.bbappend
index 5ac5e59..ac06427 100644
--- a/meta-ibm/recipes-phosphor/host/phosphor-host-postd_%.bbappend
+++ b/meta-ibm/recipes-phosphor/host/phosphor-host-postd_%.bbappend
@@ -1,2 +1,2 @@
-SNOOP_DEVICE_witherspoon-tacoma = ""
-SNOOP_DEVICE_p10bmc = ""
+SNOOP_DEVICE:witherspoon-tacoma = ""
+SNOOP_DEVICE:p10bmc = ""