usb: gsi: Prevent function remote-wakeup without function suspend

Some hosts enable function remote-wakeup immediately after
enumeration. But they don't perform function_suspend before U3
and also don't disable function remote-wakeup even if entering
deep sleep state and don't intend to wakeup from USB. One of the
reason could be that they rely on device to initiate remote-wakeup
only if it function suspended. Hence, update the check to initiate
function remote-wakeup only if device is function suspended.

Change-Id: I3d6bb817d9174f94051b1e1ef74dc9c941c66f4c
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>