usb: gadget: Add remote wakeup support to f_rmnet BAM-BAM

On USB suspend, f_rmnet with BAM-BAM transport will register for BAM
wakeup notification. Upon wakeup event from the BAM, the u_bam will
trigger a USB remote wakeup.

Change-Id: I1d1be987f225c0b2edf5bf9af75e2dd15f8c045a
Signed-off-by: Amit Blay <ablay@codeaurora.org>
7 files changed