tgafb accelerated code

Add accelerated panning and accelerated color and mono image drawing.
Please apply.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Acked-by: Maciej W. Rozycki <macro@linux-mips.org>  (tested, too!)
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>