Revert "default: remove i2c-tools repo"

This reverts commit 072bf0ec.

The AP2A (QPR2) release is causing us too much issues:
new lunch targets, different CTS/VTS behaviour,
4k playback regression, ...

Since we are updating AP1A.240505.004 instead, we still need the
i2c-tools repo.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>