19825: drivers: rename st7735 to more generic st77xx r=aabadie a=gschorcht
### Contribution description
This PR provides the following changes:
- renames the driver `st7735` to `st77xx`
- renames the test `st7735` to `st77xx`
- models controller variants as pseudomodules `st7735`, `st7789` and `st7796`
- removes the buggy initialization as a workaround to use reset defaults, see issue #19818
- adds backward compatibility header files for `ST7735_PARAM_*` symbols
- adds a test board for compilation test of backward compatibility
- updates the corresponding board definitions
The PR should solve the remaining dependency issues in KConfig we had by using `st7735` module for different controller variants. The backward compatibility header files should work for boards that still use `ST7735_PARAM_*` in their board definitions so that the board defintions at user's side use shouldn't be affected.
~To be compilable, the PR includes PR #19824.~
### Testing procedure
- Green CI
- `tests/drivers/disp_dev` and `tests/drivers/st77xx` should still work for all boards using a ST77xx display.
- The PR was already tested for these tests for:
- [x] `adafruit-pybadge`
- [x] `esp32s2-lilygo-ttgo-t8`
- [x] `esp32s3-usb-otg`
- [x] `sipeed-longan-nano`
### Issues/PRs references
Workaround for issue #19818
Preqruisite for PR #19827
Co-authored-by: Gunar Schorcht <gunar@schorcht.net>
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