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/state/phosphor-post-code-manager_%.bbappend b/meta-ibm/recipes-phosphor/state/phosphor-post-code-manager_%.bbappend
index f8ff901..bee5a5f 100644
--- a/meta-ibm/recipes-phosphor/state/phosphor-post-code-manager_%.bbappend
+++ b/meta-ibm/recipes-phosphor/state/phosphor-post-code-manager_%.bbappend
@@ -1,4 +1,4 @@
 # Set MaxBootCycleCount to 5 on IBM systems
-EXTRA_OECMAKE_append_p10bmc = "-DMAX_BOOT_CYCLE_COUNT=5"
-EXTRA_OECMAKE_append_witherspoon-tacoma = "-DMAX_BOOT_CYCLE_COUNT=5"
+EXTRA_OECMAKE:append:p10bmc = "-DMAX_BOOT_CYCLE_COUNT=5"
+EXTRA_OECMAKE:append:witherspoon-tacoma = "-DMAX_BOOT_CYCLE_COUNT=5"