USB: serial: use generic method if no alternative is provided in usb serial layer
This patch makes use of the generic method if a serial driver provides no implementation. This simplifies implementing suspend/resume support in serial drivers. Signed-off-by: NOliver Neukum <oneukum@suse.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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