ipa: Add support in ipa-usb driver for rmnet_cv2x

Only one RmNET instance is supported till now, so
there was a check to not to support additonal
protocol in ipa usb driver.
With respect to auto use case requirement we need to
support two rmnet instance, newly added rmnet_cv2x
along with legacy rmnet.
Modify code to support additional rmnet_cv2x teth
interface with respect to protocol, pm states.

Change-Id: I83984de859919a395f1115c8e2a37004d01f0688
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>