parisc: remove empty SERIAL_PORT_DFNS in serial.h
If architectures don't support SERIAL_PORT_DFNS, they need not define it to "nothing", the related drivers need do it by themselves (e.g. 8250 serial driver). Signed-off-by: NChen Gang <gang.chen@asianux.com> Signed-off-by: NHelge Deller <deller@gmx.de>
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