video: Fix splash screen alignment

commit d484b52 "video: Skip bitmaps which do not fit into the screen in
cfb_console" breaks splash screen alignment which is passed in as magic
(BMP_ALIGN_CENTER) x/y coordinates. Moving the check after the alignment block
fixes this.

Signed-off-by: Matthias Weisser <weisserm@arcor.de>
Acked-by: Simon Glass <sjg@chromium.org>