serial: 8250_of: Switch to use uart_read_port_properties()

Since we have now a common helper to read port properties
use it instead of sparse home grown solution.

Reviewed-by: Andi Shyti <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Tested-by: Florian Fainelli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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