usb: f_gsi: Report Function Remote Wake capabilities

Add support for sending Function Wake capabilities in
response to GET_STATUS from the host. GET_STATUS addressed
to an Interface allows the device to report if it is capable
of doing a Function Remote Wake. Windows8/10 MBIM hosts request
this information before enabling Suspend in SS mode.

Change-Id: Ic0a6db57b2b46804a82847de511feb433a3dfca6
Signed-off-by: Devdutt Patnaik <dpatnaik@codeaurora.org>
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>