sisfb: move XGI POST RAM type detection into a subroutine

Move XGI POST RAM type detection into a separate subroutine to make
further code changes easier. No changes in functionality

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
1 file changed