Documentation | user/bsps/arm: Add documentation for Xilinx Versal RPU BSP (!209)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion on user/bsps/arm/xilinx-versal-rpu.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/209#note_138491

 > + BIF file.
 > +```
 > +...
 > +{ core=r5-lockstep, file=/build_dir/hello.exe }
 > +...
 > +```
 > +
 > +> During Linux boot, unused peripherals are [powered down](https://docs.amd.com/r/2025.1-English/ug1304-versal-acap-ssdg/Power-Management-Using-XPm_InitFinalize
 > +), including triple timer counters (TTC).
 > +In order to avoid an unexpected power down of the TTC used by RTEMS, there are 
 > +several solutions:
 > +> - Request the node in the RTEMS application (see [XPm_RequestNode](https://docs.amd.com/r/2025.1-English/ug1304-versal-acap-ssdg/Requesting-and-Releasing-a-Node)).
 > +> - Modify PLM firmware in order to exclude triple timer counter from power down
 > + list (see `IsDevExcluded()` in [xpm_subsystem.c](https://github.com/Xilinx/embeddedsw/blob/master/lib/sw_services/xilpm/src/versal_common/server/xpm_subsystem.c#L171)).
 > +
 > +## TTC debug

I see it mentioned in the section above, so this one is probably fine.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/209#note_138491
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