utils: Add API for CRC validation

- Added the validation functions for `pldm_edac_crc32_validate`.

Motivation:
Checksum validation is a hazard for fuzzing. Provide an API that
allows us to adjust t

utils: Add API for CRC validation

- Added the validation functions for `pldm_edac_crc32_validate`.

Motivation:
Checksum validation is a hazard for fuzzing. Provide an API that
allows us to adjust the implementation of the test depending on
whether we are building to fuzz the library implementation.

Change-Id: Iffd245fe5cbcadb1037cd1f5065ccc1da6502562
Signed-off-by: Carter Chen <carter.chen.wiwynn@gmail.com>

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