Revert "usb : Add sysfs files to control port power."

This reverts commit ca9c9d0c.

Rafael wants more time to work on the user api to handle port power
issues, so let's just revert the sysfs changes for now.

Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Lan Tianyu <tianyu.lan@intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>