Revert obsolete workaround that disabled ThinLTO for libBionicStandardTests

Bug: http://b/218788252

The underlying bug in ThinLTO is fixed.  But the revert doesn't turn LTO
on for the test though.  It is disabled globally for all tests.

Test: m libBionicStandardTests
Change-Id: I89454013b584e9f46492a530cbadff3f934b68eb

Author: pirama-arumuga-nainar

tests/Android.bp

@@ -566,12 +566,6 @@ cc_test_library {
     },
 
     generated_headers: ["generated_android_ids"],
-
-    // Bug: http://b/218788252 IR verifier too strict for ifunc resolver that
-    // accept parameters.
-    lto: {
-        never: true,
-    },
 }
 
 cc_test_library {