[test262 cleanup] Remove SIMD test skipping

These tests are gone from upstream.

Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ie69be268d493a52e0d64b7bb216f3135dd111188
Reviewed-on: https://chromium-review.googlesource.com/853195Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50391}

test/test262/test262.status

@@ -224,9 +224,6 @@
   'language/global-code/script-decl-func-err-non-configurable': [FAIL],
   'language/global-code/script-decl-var-collision': [FAIL],
 
-  # https://bugs.chromium.org/p/v8/issues/detail?id=4124
-  'built-ins/Simd/*': [SKIP],
-
   # https://bugs.chromium.org/p/v8/issues/detail?id=4958
   'built-ins/Function/prototype/toString/*': ['--harmony-function-tostring'],