staging: xgifb: XGI_GetVCLK2Ptr(): delete IF_DEF_LVDS check

Delete IF_DEF_LVDS check, this function is never called when it's true.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>