sdhci-pci: remove sd detect pin enabling workaround

sdhci-pci: remove sd detect pin enabling workaround

BZ: 22694

SD detect GPIO aon_69 needs to works as a normal GPIO function. Driver
has to hack and change this. But finally IFWI help to change aon_69 to
work as normal GPIO function. So remove the software workaround

Change-Id: Ic9354588a5bbf52e32816815daa184dab55c1f75
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-on: http://android.intel.com:8080/34250
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>