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>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 2b868e6..7d73ea0 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -89,3 +89,5 @@
 adsvix	ARM	PXA27x	7610db1   2008-07-30	Adrian Filipi <adrian.filipi@eurotech.com>
 R5200	ColdFire	48ead7a   2008-03-31	Zachary P. Landau <zachary.landau@labxtechnologies.com>
 CPCI440	powerpc	440GP	b568fd2   2007-12-27	Matthias Fuchs <matthias.fuchs@esd-electronics.com>
+PCIPPC2	powerpc	MPC740/MPC750 -	  -		Wolfgang Denk <wd@denx.de>
+PCIPPC6	powerpc	MPC740/MPC750 -	  -		Wolfgang Denk <wd@denx.de>