[OpenBIOS] Sparc device tree fixed

[Blue Swirl]

I finally remembered one trick I did in Proll, zs at 0,0 must be after the 
other zs node. This helped OpenBIOS also, now we get command prompt in Qemu 
sparc-test using unbuffered Forth tree.

We can also bump the Prom version to 3, which was not possible before due to 
mixed trees (inst2pkg didn't work with Proll ids).

Available memory length was not correct, and that caused memory corruption 
problems.

Trying to boot from :d partition helps NetBSD booting.

The ESP fix is related to new SCSI handling code in Qemu CVS.

In my CD booting tests OpenBIOS matches Proll performance now, except Aurora 
1.0 doesn't recognise the CDROM. The missing features remaining are 
graphical console, SMP support (easy, but didn't work in Proll either) and 
TFTP net booting (not very useful).

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