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

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/519

Project:Branches: opticron/rtems:brmain-pl011-unnecessary-read to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

bsps/shared/serial/pl011: Avoid unnecessary reads

Avoid reading from the pl011 data register unnecessarily. There is no
need to preserve the contents of this register as it is not normal
memory. This unnecessary read causes console spam when running under the
Xen hypervisor when the read FIFO is empty since the read is not
expected.


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