RTEMS | bsp/arm/tms570: tms570_pom_remap programs non-existent ETO field for LC43x variant (#5584)

[Avi Weiss (@thnkslprpt)]

Avi Weiss created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5584



## Summary
In `bsps/arm/tms570/start/tms570-pom.c`
```c
  TMS570_POM.GLBCTRL = TMS570_POM_GLBCTRL_ON_OFF(0xa) |
                       TMS570_POM_GLBCTRL_ETO(0xa) |
                       (TMS570_POM_GLBCTRL_OTADDR(~0) &
                        pom_global_overlay_target_address_start);
```

`LS31x` variants have this `ETO` field in `POMGLBCTRL`:
![image](/uploads/6d1dcb6af11bd1120b9ba2a699029c11/image.png){width=714 height=291}

but the `LC43x` variants do not:
![image](/uploads/0ddce0e6c924e332d5b223c9996b9a01/image.png){width=694 height=168}

## Expected behaviour
Guard the write to the `ETO` register for only `LS31x` variants or have 2 different versions of that section/function.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5584
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