staging: xgifb: XGI_GetRatePtrCRT2(): delete IF_DEF_LVDS check

IF_DEF_LVDS cannot be set if ProgrammingCRT2 flag is set, so remove the
check to simplify the code.

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