usb: gadget: f_ecm: Add suspend/resume and remote wakeup support

When host sends suspend notification to the device, handle
the suspend callbacks in the function driver. Depending on
the remote wakeup capability the device can either trigger a
remote wakeup or wait for the host initiated resume to resume
data transfer.

Signed-off-by: Elson Roy Serrao <quic_eserrao@quicinc.com>
Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/1679694482-16430-7-git-send-email-quic_eserrao@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>