meta-ibm: pldm: force mctp-demux

IBM systems are not ready to transition to the in-kernel MCTP, so
force the mctp-demux transport.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I76c635e0ea8e3ce6101fdc882836ca7142dce12f
diff --git a/meta-ibm/recipes-phosphor/pldm/pldm_%.bbappend b/meta-ibm/recipes-phosphor/pldm/pldm_%.bbappend
index 89ac856..d997e16 100644
--- a/meta-ibm/recipes-phosphor/pldm/pldm_%.bbappend
+++ b/meta-ibm/recipes-phosphor/pldm/pldm_%.bbappend
@@ -1,3 +1,6 @@
+# Force the mctp-demux to be used until machine is ready to use in-kernel MCTP
+PACKAGECONFIG = "transport-mctp-demux"
+
 PACKAGECONFIG += "oem-ibm"
 PACKAGECONFIG[oem-ibm] = "-Doem-ibm=enabled, -Doem-ibm=disabled, , squashfs-tools"