meta-intel-openbmc: prep for new override syntax

Ran `scripts/contrib/convert-overrides.py` from upstream Yocto and
fixed up a few by hand that were missed.

Tested: Built s2600wf.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Change-Id: I983385c8cdd4e2727c5c1a3d56952d6ac7fd89cc
diff --git a/meta-intel-openbmc/meta-common/recipes-phosphor/dbus/phosphor-mapper-config-native.bbappend b/meta-intel-openbmc/meta-common/recipes-phosphor/dbus/phosphor-mapper-config-native.bbappend
index ef991a5..50f276a 100644
--- a/meta-intel-openbmc/meta-common/recipes-phosphor/dbus/phosphor-mapper-config-native.bbappend
+++ b/meta-intel-openbmc/meta-common/recipes-phosphor/dbus/phosphor-mapper-config-native.bbappend
@@ -1 +1 @@
-PHOSPHOR_MAPPER_CONFIGS_append_intel = " intel-dbus-interfaces-mapper-config-native"
+PHOSPHOR_MAPPER_CONFIGS:append:intel = " intel-dbus-interfaces-mapper-config-native"