RTEMS | bsp/arm/tms570: Remove misnamed/stale alias TMS570_MMR_SELECT_GMII_SEL (!1271)

[Pavel Pisa (@ppisa)]

Pavel Pisa commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1271#note_155420


Generally it worth to resolve conflicting pins in TMS570LC4357 header. But I expect that they are result of mapping all pins described on TMS570LC43 HDK where some groups of pin have alternatives. So may it be the conflicting pins should be listed on some alternatives fragments.

There seems to be problem, that even definitions of some pins and functions combinations are missing. I think (not sure) that we have that right on TMS570LS3137... It would worth to add at least definitions of pins/balls used for MII on 43 Launchpad see https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/48 and commit [temslwip/tms570: Bringup lwIP network stack on TI TMS570LC4357 BSP (LaunchXL2-570LC43)](https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/48/diffs?commit_id=a92a54494dde3d5c1f1fb5aa36c03231a37dad28). If I remember well we have prepared some really basic list of pins for 4357 somehow after main 3137 work by some scripting, but we have not own 4357 at that time nor finished pins and BSP, it has been done by others. Important part to allows pimux with separate inputs mapping specific to 4357 has been introduced
```
#define TMS570_PIN_WITH_IN_ALT(pin_num_and_fnc, pin_in_alt_num_and_fnc) \
  ((pin_num_and_fnc) | ((pin_in_alt_num_and_fnc) << TMS570_PIN_IN_ALT_SHIFT))
```  
So for pins which have this another register to choose input from peripheral it is necessary to define what should be written to regular MMR (0 to 37) and what into this another direction MMR (80 to 80).

It would be ideal to coordinate changes with @ar-in0 to get correct names into RTEMS system, and add an option for build to switch to Launchpad from default HDK. Then the LwIP change can be more readable and work for both Lauchapd and HDKs.

I try to help as my time allows.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1271#note_155420
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