lib/crc: crc_kunit: Test CRC computation in interrupt contexts

Test that if CRCs are computed in task, softirq, and hardirq context
concurrently, then all results are as expected.  Implement this using
kunit_run_irq_test() which is also used by the lib/crypto/ tests.

As with the corresponding lib/crypto/ tests, the purpose of this is to
test fallback code paths and to exercise edge cases in the
architecture's support for in-kernel FPU/SIMD/vector.

Remove the code from crc_test() that sometimes disabled interrupts, as
that was just an incomplete attempt to achieve similar test coverage.

Link: https://lore.kernel.org/r/20250811182631.376302-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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