Revert "radeonfb: accelerate imageblit and other improvements"

Revert "radeonfb: accelerate imageblit and other improvements"

This reverts commit 920fcec6ceb5425c25f3e76d687bac7018b09dc7, along with
the "fixes" for it that all just caused problems:

 - 6851c3f33fd9375117d82dab7f92f6b291b0e800 "radeonfb: fix problem with
   color expansion & alignment"

 - d1aeb3919bf54e177d1889007f1280a30d9d9887 "radeonfb: Disable new color
   expand acceleration unless explicitely enabled"

because even when disabled, it breaks for people. See

	http://bugzilla.kernel.org/show_bug.cgi?id=12191

for the latest example.

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Cc: James Cloos <cloos@jhcloos.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Jean-Luc Coulon <jean.luc.coulon@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>