m68k: detect NeXT framebuffer

Doesn't work yet though:
- we don't implement heap yet,
- non-color machines have 2bpp, so we'll have to hack this in some way.

Change-Id: Idf8f69c2256837db3915949d93265decbb43a524
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3097
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

m68k: add next_m68k boot platform

Since the boot ROM API structure is declared with a custom alignment, we
simulate it with padding bytes around, and use aligntest.prg to verify
using ARAnyM + TOS/MiNT as we know how to link simple PRG files.

It now prints something to the screen then panics when initializing the
heap.

For now one must insert the loader manually into an existing floppy
image:
dd if=generated-m68k/objects/haiku/m68k/release/system/boot/next_m68k/haiku_loader.next_m68k bs=$((0x8000)) seek=1 of=next_floppy.img conv=notrunc

Change-Id: I06d74e9d85a352aab68dedce545bbe5fe9e990d5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2220
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>