RTEMS | bsps/zynq-uart: fix parity configuration handling (!1212)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1212

Project:Branches: D3athSkulll/rtems:zynq-uart-parity-fix to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

Fix parity handling in zynq_uart_set_attributes() by clearing existing parity bits before setting a new mode instead of always ORing PAR_NONE, which caused incorrect or ignored parity; also fix inverted PARODD logic and add ZYNQ_UART_MODE_PAR_MASK to manage the parity field correctly.

Fixes #5554

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1212
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