lwIP | stm32h7: Add Ethernet driver for STM32H743ZI Nucleo (!37)

[Claudio Grasso (@ClaudioGrasso)]

Claudio Grasso commented on a discussion on LICENSE.md: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/37#note_142816

 > -*/
 >  
 > +*/
 >  
 >  defs license
 >  ============
 > +
 >  /*
 > +
 >  * Redistribution and use in source and binary forms, with or without
 >  * modification, are permitted provided that the following conditions
 >  * are met:
 >  * 1. Redistributions of source code must retain the above copyright
 >  * notice, this list of conditions and the following disclaimer.
 > - * 2. Redistributions in binary form must reproduce the above copyright
 > +* 1. Redistributions in binary form must reproduce the above copyright

Hi Kinsey,

I have completely restructured the pull request. After reviewing the previous commit history, I found several inconsistencies—including the unrelated changes to README.md and the accidental modification of the **LICENSE.md** numbering—so I decided to rebuild the branch from scratch to ensure a pristine state.

The new history consists of exactly two clean commits:

1. **Import stm32h7 driver**: A pristine import verified against the upstream STM32CubeH7 repository (plus necessary 

   LICENSE.md/**README.md** updates).
   * **Integrity Verification**: I verified the integrity of these files by comparing their **MD5 checksums** against the upstream GitHub repository to ensure they are byte-for-byte identical.
   * **Corrected License**: The numbering issue in **LICENSE.md** (changing 2. to 1.) was a mistake in the previous history. By rebuilding from the pristine upstream file, this is now corrected.
2. **Adapt stm32h7 driver**: Contains all RTEMS-specific adaptations applied as additive patches with **`#ifdef __rtems__`** guards.

I have also addressed your other specific feedback:

* **Restored  wscript**: Reverted unnecessary logic changes; it now uses the default upstream configuration.
* **Cleaned Debug Code**: Removed custom **`TRACE_PRINTF`** macros and excessive debug output.
* **Reference Branch**: Ensured no unrelated files (e.g., Zynq driver changes) are included.

The branch **`pr/stm32h7-driver`** has been force-pushed, confirmed to build cleanly, and tested on hardware.

Kind regards,

Claudio

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/37#note_142816
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