1. _INSTALLS defines the packages to be installed in the image
at the build time.
2. _LAZY_INSTALLS defines the packages to be installed in the image
at the first run time
3. _DEPENDS defines the packages to at the build dependency of
the image
1. "make target/sonic-broadcom.raw" will create the compressed dd'able image.
2. This will also update the grub config files (device/dell/*/nos_to_sonic_grub.cfg) with the image versions.