Unsure of the history of the ESP32_S2_WROVER board (and why it wasn't
named GENERIC_S2_...) but now it's a variant of the generic S2 board.

Also removes the non-existent CONFIG_USB_AND_UART from all S2 boards.

This work was funded through GitHub Sponsors.
Signed-off-by: NJim Mussared <jim.mussared@gmail.com>

This commit:
- Finds a common set of board feature tags and maps existing features to
  that reduced set.
- Removes some less-useful board feature tags.
- Ensures all MCUs are specified correctly.
- Ensures all boards have a vendor (and fixes some vendor names).

This is to make the downloads page show a less intimidating set of filters.

Work done in conjunction with Matt Trentini <matt.trentini@gmail.com>.

This work was funded through GitHub Sponsors.
Signed-off-by: NJim Mussared <jim.mussared@gmail.com>

Signed-off-by: NDamien George <damien@micropython.org>

In particular the UM S2 boards (and update the features list).
Signed-off-by: NJim Mussared <jim.mussared@gmail.com>

This will be used by https://micropython.org/download/ to generate the
full listing of boards and firmware files.

Optionally supports a board.md for additional customisation of the
download page, as well as deploy.md for flashing instructions.
Signed-off-by: NJim Mussared <jim.mussared@gmail.com>