* boot.scr was growing past Jam MAXLINE and was causing segfaults
* Break out to tree, data/boot could be used for other arches
* boot.scr is getting a bit complex, but supports the old
u-boot haiku_loader, as well as u-boot starting our EFI loader.
Change-Id: I93a3167ab0bc78747c1d70fedd08595e9ac89662
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2963
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
