serial: sh-sci: Set the UPF_FIXED_PORT flag
The base address, IRQ and baud rate generator parent clock rate can't be changed by userspace. Mark the port as fixed. Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
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