meta-openpower: add org/open_power to OBMC_ORG_YAML_SUBDIRS

org/open_power is the typical YAML subdirectory for openpower-related
YAML files, so add it to the default subdirectory search list.

(From meta-openpower rev: c3944f910c0f5bfa1e7432744341061fbfbd985e)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I115ddfd6e0274dd55474bab0becfccc523754866
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-openpower/conf/distro/include/openpower-distrovars.inc b/meta-openpower/conf/distro/include/openpower-distrovars.inc
index 479e099..12f848b 100644
--- a/meta-openpower/conf/distro/include/openpower-distrovars.inc
+++ b/meta-openpower/conf/distro/include/openpower-distrovars.inc
@@ -2,3 +2,5 @@
 DISTRO_FEATURES_FILTER_NATIVE += "openpower"
 DISTRO_FEATURES_FILTER_NATIVESDK += "openpower"
 DISTROOVERRIDES .= ":df-openpower"
+
+OBMC_ORG_YAML_SUBDIRS += " org/open_power"