CMFSUPPORT-3454 Add MIDDLEWARE_ARCH config required by meta-rdk layer

Author: scthunderbolt

conf/layer.conf

@@ -16,3 +16,6 @@ require ${@bb.utils.contains('DISTRO_FEATURES', 'em_extender','conf/distro/inclu
 require ${@bb.utils.contains('DISTRO_FEATURES', 'em_extender','conf/include/rdk-bpi-ap-extender-bbmasks.inc','conf/include/rdk-bpi-bbmasks.inc', d)}
 
 LAYERSERIES_COMPAT_cmf-bananapi = " kirkstone"
+
+MIDDLEWARE_ARCH = "${MACHINE}"
+PACKAGE_EXTRA_ARCHS:append = " ${MIDDLEWARE_ARCH}"