usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
Renesas R-Car and RZ/G SoCs have a firmware download mode over USB. However, on reset a banner string is transmitted out which is not expected to be echoed back and will corrupt the protocol. Cc: stable <stable@vger.kernel.org> Acked-by: NOliver Neukum <oneukum@suse.com> Signed-off-by: NChris Brandt <chris.brandt@renesas.com> Link: https://lore.kernel.org/r/20201111131209.3977903-1-chris.brandt@renesas.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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