Use the MMC core's ability to poll for card detection.  This also has
the advantage of doing the gpio_get_value from a workqueue instead of
timer, allowing the gpio to be on a sleeping gpiochip.
Acked-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NRabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>