Staging: xgifb: Remove unneeded XGI_LCD_TYPE enumeration.

LCD_TYPEs are taken from drivers/video/sis/sis.h, so this enumeration is not
needed.

Signed-off-by: Miguel Gómez <magomez@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>