Many UART CSRs are volatile

[MikeOpenHWGroup]

Update to the uDMA UART chapter to define the term volatile CSR and indicate which of the UART CSRs are volatile.

[datum-dpoulin]

Are these changes meant to make the UART CSRs compatible with the Moore.io Register model generator? Because this format is not compatible at all. I had to modify it heavily to make it work: https://github.com/Datum-Technology-Corporation/core-v-mcu-uvm/blob/main/dv/uvme_cvmcu/bin/udma_uart.csv

[MikeOpenHWGroup]

Update:

1. Pushed in a change to clean up access modes for a few CSRs.
2. Added Do Not Merge label - this PR may be superseded by another (pending) PR.

[MikeOpenHWGroup]

Hi @cst-aditya, this PR may be of interest to you. I would like to have this update about the volatile/non-volatile nature of UART CSRs included in your pending update of the UART section of the User Manual.

[cst-aditya]

Hi @MikeOpenHWGroup , thank you for letting me know . I will check and get back to you if I have any questions.