Removes more PC9800 code.

Requires:

  bk rm drivers/char/upd4990a.c
  bk rm drivers/net/ne2k_cbus.c
  bk rm drivers/net/ne2k_cbus.h
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>