MAINTAINERS: TPM DEVICE DRIVER: update the W-tag

Git hosting for the test suite has been migrated from Gitlab to Codeberg,
given the "less hostile environment".

Link: https://lkml.kernel.org/r/20240618133556.105604-1-jarkko@kernel.org
Link: https://codeberg.org/jarkko/linux-tpmdd-test
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>