powerpc/crc: delete obsolete crc-vpmsum_test.c

Delete crc-vpmsum_test.c, since its functionality is now covered by the
new crc_kunit.c as well as the crypto subsystem's fuzz tests.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Vinicius Peixoto <vpeixoto@lkcamp.dev>
Link: https://lore.kernel.org/r/20241202012056.209768-12-ebiggers@kernel.org


Signed-off-by: Eric Biggers <ebiggers@google.com>