scripts: Don't clear the @portage symlink

This is a known symlink will be created by the @portage rule.

BUG=none
TEST=BOARD=arm64-generic bazel query @portage// and verify symlink is
still in place.

See: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/4595138
Change-Id: I3ff1900204984a365313c38d1233b5884986a42e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4754333
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Raul Rangel <rrangel@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Auto-Submit: Raul Rangel <rrangel@chromium.org>
diff --git a/scripts/bazel.py b/scripts/bazel.py
index 817a8dd..958aedf 100644
--- a/scripts/bazel.py
+++ b/scripts/bazel.py
@@ -32,6 +32,7 @@
     "bazel-out",
     "bazel-src",
     "bazel-testlogs",
+    "@portage",
 ]
 
 # Workspaces for each project are defined here.