au1xmmc: remove custom carddetect poll implementation.
au1xmmc: remove custom carddetect poll implementation.

The MMC core provides a carddetect poll feature, time to
remove the driver's own implementation of it.

Signed-off-by: Manuel Lauss <abf1aa4a5e1ac3fe9069b2a7add8400e4e267223@roarinelk.homelinux.net>
Signed-off-by: Pierre Ossman <8b64f2aeec7ea42cd6838e5b2901f7aa61dfa5d4@drzeus.cx>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs