licensing: drop ENABLE_LICENSING transitional knob

We had this while the code was under development, but we're long
past that point now.  Clean it up to simplify.

BUG=None
TEST=CQ passes

Change-Id: Ia140d6324da61365cc392997c1ceb64efd542cfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2303217
Reviewed-by: Alex Klein <saklein@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/hooks/install/gen-package-licenses.sh b/hooks/install/gen-package-licenses.sh
index 8188c80..0e70f96 100755
--- a/hooks/install/gen-package-licenses.sh
+++ b/hooks/install/gen-package-licenses.sh
@@ -7,10 +7,6 @@
 {
   local PKG="${CATEGORY}/${PF}"
 
-  if [[ "${ENABLE_LICENSING}" != "Y" ]]; then
-    return
-  fi
-
   # This expands to something like
   # /build/x86-alex/tmp/portage/dev-util/libc-bench-0.0.1-r6
   # Run FEATURES='noclean' emerge-x86-alex libc-bench to prevent having the