net: wwan: t7xx: Add port proxy infrastructure

Port-proxy provides a common interface to interact with different types
of ports. Ports export their configuration via `struct t7xx_port` and
operate as defined by `struct port_ops`.

Signed-off-by: Haijun Liu <[email protected]>
Co-developed-by: Chandrashekar Devegowda <[email protected]>
Signed-off-by: Chandrashekar Devegowda <[email protected]>
Co-developed-by: Ricardo Martinez <[email protected]>
Signed-off-by: Ricardo Martinez <[email protected]>
Reviewed-by: Loic Poulain <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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