Revert "usb: host: skip xHCI power management upon port suspend"

This reverts commit commit 40041445 ("usb: host: skip xHCI power
management upon port suspend"). The host controller does need to clear
run/stop bit upon suspend and set it upon resume in order to properly
support controller entering/exiting low power mode.

Change-Id: I4e82a5725d24eec613846d7a5155c2f6d3b4fd3c
Signed-off-by: Jack Pham <jackp@codeaurora.org>