(mostly based on pmax)
- pass symbol info from bootloader to kernel via bootinfo
(currently bootinfo is allocated in the bootloader and
copied by kernel later; maybe we should rethink about this)
- use passed bootinfo to initialize ksyms(4) in kernel
- remove options SYMTAB_SPACE from kernel config files
- bump bootloader version
ELF kernels instead of booting ECOFF kernels directly by ARCBIOS.
Tested on my NEC-J96A and NEC-JC94, and ok'ed by soda.
XXX: Maybe we should share some of these sources with sgimips
XXX: (in sys/dev/arcbios/stand?)