unicode: implement utf8 unit tests as a KUnit test suite.

This translates the existing utf8 unit test module into a KUnit-compliant
test suite. No functionality has been added or removed.

Some names changed to make the file name, the Kconfig option and test
suite name less specific, since this source file might hold more utf8
tests in the future.

Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
[GKB: Fix checkpatch's complaint]
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
3 files changed