Add more BOOTSTD_FULL features to BOOTSTD

It seems that the current minimalist approach is not working too well, so we should make some changes.

Comments from Tom:

Right. But now that we've tried this, some of the feedback has been that it's just too minimal right now. Like looking at the help message for bootflow, list and info should probably always be available. And maybe the flags for "scan" should be re-thought? Too late to change things now but "bootflow scan -b" should maybe how it's always been for "scan and boot".