usb: typec: tcpm: Respond Not_Supported if no snk_vdo
If snk_vdo is not populated from fwnode, it implies the port does not support responding to SVDM commands. Not_Supported Message shall be sent if the contract is in PD3. And for PD2, the port shall ignore the commands. Fixes: 193a6801 ("staging: typec: tcpm: Respond to Discover Identity commands") Cc: stable <stable@vger.kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Kyle Tso <kyletso@google.com> Link: https://lore.kernel.org/r/20210523015855.1785484-3-kyletso@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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