package/pkg-utils: show-info: do not show install types for host packages

package/pkg-utils: show-info: do not show install types for host packages

By their very nature, host packages have no target, staging, or
images install steps; they have a single install step, that is
always performed.

However, we currently report those three types of install, which
is misleading at best, and really incorrect.

If we were to report any install type for host package, that would
be a single one, and it would always be true.

So, do not report any install type for host packages, as it does
not make sense to report anything that is always true.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Vadim Kochan <vadim4j@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: eeppeliteloop@gmail.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>