The steps you mentioned are the ones you need to use but instead of checking out the daisy branch you need to use dizzy-next. This is because the latest BSP sources for the Intel Edison platform are now Yocto 1.7.2 (Dizzy). Once you have cloned the layer into edison-src/meta-intel-edison you need to add this new layer into the config/bblayers.conf. Now you can add the packages you want in the Edison build in the local.conf file. I hope this helps.