meta-phosphor: add mctp and pldm distro features

Add include files for the MCTP and PLDM distro features, which
can be included into a machine that uses those features.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I71bfc2441097b4e031c065f88227d869d8007f47
diff --git a/meta-phosphor/conf/distro/include/mctp.inc b/meta-phosphor/conf/distro/include/mctp.inc
new file mode 100644
index 0000000..a7ba57f
--- /dev/null
+++ b/meta-phosphor/conf/distro/include/mctp.inc
@@ -0,0 +1,2 @@
+DISTRO_FEATURES += "mctp"
+DISTROOVERRIDES .= ":df-mctp"