Pull up following revision(s) (requested by tsutsui in ticket #1446):

sys/arch/zaurus/conf/GENERIC: revision 1.89
sys/arch/zaurus/stand/zbsdmod/zbsdmod.c: revision 1.12
sys/arch/zaurus/conf/INSTALL: revision 1.40
sys/arch/zaurus/zaurus/machdep.c: revision 1.40
sys/arch/zaurus/zaurus/machdep.c: revision 1.45
sys/arch/zaurus/conf/GENERIC: revision 1.85

Yes, we need to load symbols, but we don't need the whole DDB infrastructure
for that.

bye ddb and we fit again.

Make zaurus kernels use symbol tables loaded by the bootloader.
Now COPY_SYMTAB is no longer necessary and it saves ~500kbytes of
GENERIC, so re-enable options DDB (i.e. revert GENERIC rev 1.85).

Also fix zbsdmod.o (a kernel loader for Zaurus Linux) to load symbols
at a proper address as the MI sys/lib/libsa/loadfile_elf32.c does.

No particular comment on port-zaurus@:

https://mail-index.netbsd.org/port-zaurus/2019/11/11/msg000086.html

Note zbsdmod.c (derived from OpenBSD/zaurus) assumed that the loaded
kernels had "esym" variable at the top of its data section and
implicitly overwrote it with the address of loaded symbol tables.
OpenBSD/zaurus kernels used the esym value written by the zbsdmod.o
to initialize ksyms(4) on startup, but we will avoid such implicit
MD interface between the bootloader and kernels (though we don't
bother to add a symbol address value into bootinfo but just assume
symbols are loaded at end[] of a loaded kernel, as per the MI
libsa loadfile() implementation).

Worth to pullup to both netbsd-8 and netbsd-9.

(martin)