usb: otg: Add device tree parameter lpm-on-dev-suspend

The lpm-on-dev-suspend parameter permits the MSM otg
to enter to USB low power mode upon usb bus suspend.
Add a read for this parameter also for targets which
use device tree.

Change-Id: I72bf3b5fd17c7c64d59a0fa708002735f9cd224b
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>
2 files changed