Revert "usb: gadget: Add function wakeup support"

This reverts commit e36d975b which is
commit f0db885f upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I56b3a1daccf44443aa4142534777b97bb3a70d14
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>