meta-ibm: Enable com/ibm D-Bus interfaces on all systems

phosphor-dbus-interfaces recipe requires that we add to the
OBMC_ORG_YAML_DIRS, the directory paths where the interface
YAMLs reside. On IBM systems, we need com/ibm to be addded
to that list.

Tested: Built Witherspoon and Rainier images cleanly.

Signed-off-by: Santosh Puranik <santosh.puranik@in.ibm.com>
Change-Id: Ib446373d8d49bcbda04bc91378f8a35a53406f31
diff --git a/recipes-phosphor/dbus/phosphor-dbus-interfaces_%.bbappend b/recipes-phosphor/dbus/phosphor-dbus-interfaces_%.bbappend
new file mode 100644
index 0000000..0c632a1
--- /dev/null
+++ b/recipes-phosphor/dbus/phosphor-dbus-interfaces_%.bbappend
@@ -0,0 +1,2 @@
+OBMC_ORG_YAML_SUBDIRS_append_witherspoon = " com/ibm"
+OBMC_ORG_YAML_SUBDIRS_append_rainier = " com/ibm"