lib/crypto: tests: Add a .kunitconfig file

lib/crypto: tests: Add a .kunitconfig file

Add a .kunitconfig file to the lib/crypto/ directory so that the crypto
library tests can be run more easily using kunit.py.  Example with UML:

    tools/testing/kunit/kunit.py run --kunitconfig=lib/crypto

Example with QEMU:

    tools/testing/kunit/kunit.py run --kunitconfig=lib/crypto --arch=arm64 --make_options LLVM=1

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260301040140.490310-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>