msm: ipa4: do not send USB remote wakeup again if already sent

Add the check to not send the remote wakeup again if last remote
wakeup hasn't taken effect and usb state not been changed yet.

Change-Id: I55b2285264f85dfa4befedae4a1af5e6eaf71c4b
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>