Revert "Exclude jdk_security4 test on jdk8 linux (#5220)" (#5772)

This reverts commit 1ef8a6f.

Author: sxa

openjdk/excludes/ProblemList_openjdk8.txt

@@ -280,7 +280,6 @@ sun/security/provider/DSA/TestAlgParameterGenerator.java https://github.com/adop
 
 sun/security/krb5/auto/ReplayCacheTestProc.java https://github.com/adoptium/aqa-tests/issues/2349 generic-all
 sun/security/krb5/auto/Unreachable.java https://github.com/adoptium/aqa-tests/issues/2353 aix-all,macosx-all
-sun/security/krb5/auto/rcache_usemd5.sh https://bugs.openjdk.org/browse/JDK-8258855 linux-aarch64
 
 ############################################################################