ppc: Remove PCIPPC2 and PCIPPC6 boards

These boards seem to be unmaintained for quite some time. So lets
remove support for them completely. This also cleans up some
common drivers/files.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Guillaume Alexandre <guillaume.alexandre@gespac.ch>
Acked-by: Wolfgang Denk <wd@denx.de>
27 files changed