security/crypto: fix RHEL release check

Bruno Meneguelerequested to merge
bmeneg/kernel-tests:crypto-check-fix into main

rlIsRHEL is not a conditional operator but a function and conditions using the && operator were failing with the following error. This commit fixes it by properly calling rlIsRHEL twice.

./runtest.sh: line 57: <9.5: command not found

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