Remove java.lang (re)definition tests from class_linker_test

There is a dx issue when processing extensions of java.lang package.

"
...
trouble processing "java/lang/JavaLangFromD.class".
Ill-advised or mistaken usage of a core class (java.* or javax.*)
when not building a core library.
...
"

Remove the checks until we figure out how to verify this behavior on all
our configurations.

This is a partial revert of commit
cdd4912e.

Test: ANDROID_COMPILE_WITH_JACK=false cmma
test-art-host-gtest-class_linker_test
Bug: 38138251

Change-Id: Ib05253eaebab1299dfb36b54a7c99d3362a7ed72