TTY: serialP, remove unused material

First, remove unused macro and rs_multiport_struct structure. Nobody
uses them at all.

Further, the 2 drivers (they are below) which use the rest of
structures from serialP.h (async_struct and serial_state) do not use
all the members. Remove the members:
* which are unused or
* which are only initialized and never used for something real.

Everybody should avoid the structures with a looong distance.

Finally, remove the ALPHA kludge MCR quirks. They are 1:1 copy from
8250.h. No need to redefine them here.

The 2 promised users of the structures:
arch/ia64/hp/sim/simserial.c
drivers/tty/amiserial.c

Signed-off-by: Jiri Slaby <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Fenghua Yu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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