intelfb: support i854

Support the Intel 854 Chipset in fbdev.

We test and use the patch on a Thomson IP1101 IPTV-Box.  On the VGA-Port
we get a normal signal.

Here is the link to the Mambux-Project: http://www.mambux.de

Cc: Keith Packard <keithp@keithp.com>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Stefan Husemann <shusemann@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>