Have meta-arm-bsp specific bbappends as BBFILES_DYNAMIC

The boot-wrapper-aarch64_%.bbappend and firmware-image-juno.bbappend
should be only considered when meta-arm-bsp layer is present.

Change-Id: Id66a989820675a281946a26b9afec6d5b3d29bca
Issue-Id: SCM-984
Signed-off-by: Diego Sueiro <diego.sueiro@arm.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-autonomy/conf/layer.conf

@@ -29,3 +29,6 @@ ARM_AUTONOMY_DISTRO_CFGDIR = "${LAYERDIR}/conf/distro/include/"
 # Add class to handle arm-autonomy distro extensions
 USER_CLASSES_append = " arm-autonomy-features"
 
+BBFILES_DYNAMIC += " \
+    meta-arm-bsp:${LAYERDIR}/dynamic-layers/meta-arm-bsp/*/*/*.bbappend \
+"