This commit removes support for the Freescale MPC82xx Power
Architecture processors, i. e. MPC8240, MPC8245, MPC8247, MPC8248,
MPC8250, MPC8255, MPC8260, MPC8265, MPC8266, MPC8272, MPC8280, ...

They have been out of production for years, and no active users left
here.  As some boards start causing problems, let's drop the obsolete
and now dead code.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Brad Kemp <Brad.Kemp@seranoa.com>
Cc: Frank Panno <fpanno@delphintech.com>
Cc: Greg Allen <gallen@arlut.utexas.edu>
Cc: Heiko Schocher <hs@denx.de>
Cc: Holger Brunck <holger.brunck@keymile.com>
Cc: Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
Cc: Jim Thompson <jim@musenki.com>
Cc: Josef Wagner <Wagner@Microsys.de>
Cc: Murray Jensen <Murray.Jensen@csiro.au>
Cc: Oliver Brown <obrown@adventnetworks.com>
Cc: Rune Torgersen <runet@innovsys.com>
Cc: Sangmoon Kim <dogoil@etinsys.com>
Cc: Torsten Demke <torsten.demke@fci.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Yuli Barcohen <yuli@arabellasw.com>
Cc: Yusdi Santoso <yusdi_santoso@adaptec.com>