All platforms now pass the CD and RO GPIOs to the MMC SPI driver, those
callbacks are not used anymore. Remove them.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: NChris Ball <cjb@laptop.org>