[PATCH] atyfb: Fix sparse warnings

Silence some sparse warnings:
* Remove casts from atari out_le32() and friends.
* Move accel functions' declarations to atyfb.h.

Signed-off-by: Ville Syrjala <syrjala@sci.fi>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>