test_hash.c: refactor into kunit

Use KUnit framework to make tests more easily integrable with CIs.  Even
though these tests are not yet properly written as unit tests this
change should help in debugging.

Also remove kernel messages (i.e.  through pr_info) as KUnit handles all
debugging output and let it handle module init and exit details.

Link: https://lkml.kernel.org/r/[email protected]
Reviewed-by: David Gow <[email protected]>
Reported-by: kernel test robot <[email protected]>
Tested-by: David Gow <[email protected]>
Co-developed-by: Augusto Durães Camargo <[email protected]>
Signed-off-by: Augusto Durães Camargo <[email protected]>
Co-developed-by: Enzo Ferreira <[email protected]>
Signed-off-by: Enzo Ferreira <[email protected]>
Signed-off-by: Isabella Basso <[email protected]>
Cc: Brendan Higgins <[email protected]>
Cc: Daniel Latypov <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Rodrigo Siqueira <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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