MMC: MMCI: use gpiolib for card detect/write protect

Use gpiolib where available (and when valid GPIOs are provided) for
write protect/card detect status reporting.  We fall back to the old
'status' method where gpiolib support is not available.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc drivers/mmc/host/mmci.c
Simple merge

diff --cc drivers/mmc/host/mmci.h
Simple merge