examples/fips_validation: fix HMAC test

examples/fips_validation: fix HMAC test

Application was failing as the HMAC and
Plain SHA fips request files are similar in a
way that they both have SHA- in the top section to
determine the hash algo and hash sizes. And HMAC having the
algo in the second line but the Plain SHA in the third
meant that when the HMAC files was used once it parsed the third
line Plain SHA was set as the algo and not HMAC.

USER1: Failed to get capability for cdev 0
USER1: Error -22: test block
[L=20 SHAAlg=SHA_2]
USER1: Error -22: Failed test /root/FIPS/HMAC/req/HMAC.req

Fixes: f4797bae0050 ("examples/fips_validation: support plain SHA")

Signed-off-by: Marko Kovacevic <marko.kovacevic@intel.com>