Revert "mmc: fix a race between card-detect rescan and clock-gate work instances"

Revert "mmc: fix a race between card-detect rescan and clock-gate work instances"

BugLink: http://bugs.launchpad.net/bugs/788691

commit 86f315bbb2374f1f077500ad131dd9b71856e697 upstream.

This reverts commit 26fc8775b51484d8c0a671198639c6d5ae60533e, which has
been reported to cause boot/resume-time crashes for some users:

https://bbs.archlinux.org/viewtopic.php?id=118751.

Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Steve Conklin <sconklin@canonical.com>