tty: serial: lpuart: introduce lpuart_soc_data to represent SoC property

This is used to dynamically check the SoC specific lpuart properies.
Currently only the iotype is added, it functions the same as before.
With this, new chips with different iotype will be more easily added.

Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Stefan Agner <[email protected]>
Cc: Mingkai Hu <[email protected]>
Cc: Yangbo Lu <[email protected]>
Cc: Fugang Duan <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Nikita Yushchenko <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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