populate_sdk_ext: Add images to SDK_INSTALL_TARGETS
When running ext-sdk-prepare.py during sdk installation a check is done to
make sure no tasks would run that aren't provided by the "leaf" recipes
specified in SDK_INSTALL_TARGETS.
However sometimes an image recipe can cause other images to be created
such as an initramfs. So make sure those additional images are
recognized by ext-sdk-prepare.py and don't flag an error.
Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
