crypto: asymmetric_keys - add KUnit tests for the PE parser

Add self-contained KUnit tests for pefile_parse_binary(), exercised
through verify_pefile_signature() -- which parses the image before any
signature check, so no keyring or real signature is needed. The cases
build small malformed PE images in memory:

  - a PE declaring 0 data-directory entries: the certificate table entry
    at fixed index 4 is absent and must be rejected (-ELIBBAD), not read
    out of bounds;
  - a PE declaring 5 entries with a zero (unsigned) certificate entry
    gets past the directory bound and is rejected as unsigned (-ENODATA).

verify_pefile_signature() is not exported, so the test is built-in only
(bool, not tristate).

Signed-off-by: Fabrice Derepas <fabrice.derepas@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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