boot/ppc: Cleanup paths, use hfs vs hfsplus

* Move assets to new boot directory
* -hfsplus not valid anymore on cdrtools 3.02
* Throw down some forth I saw in an *old* fedora 12
chrp script. If we ever target ppc64 it might be
handy someday. The text output also lets you know
the cd booted successfully.

Change-Id: I169d887fe8373de1719b98305d01b714f6f6bcbe
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4681
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jessica Hamilton <jessica.l.hamilton@gmail.com>