atyfb: atyfb: Unshare pseudo_palette

atyfb: Move the pseudo palette into the card-specific atyfb_par, so it's no
longer shared among multiple cards

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>