serial: vt8500: Add devicetree support for vt8500-serial
Increase vt8500_max_ports to 6 as the WM8505 as 6 available uarts. Use devicetree port id as primary addressing for ports but allow auto-allocation if id not specified. Signed-off-by: NTony Prisk <linux@prisktech.co.nz> Acked-by: NAlan Cox <alan@linux.intel.com>
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