RTEMS | bsps/shared/serial/pl011: Avoid unnecessary reads (!519)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion on bsps/shared/dev/serial/arm-pl011.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/519#note_124981

 >    const char ch
 >  )
 >  {
 > -  regs_base->uartdr = PL011_UARTDR_DATA_SET(regs_base->uartdr, ch);
 > +  regs_base->uartdr = PL011_UARTDR_DATA_SET(0, ch);

There are technically bits above the read or written character that are only valid on read. I have changed the macro used to not take an initial value.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/519#note_124981
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