Android: Always use public SDK for generate_jni & aidl

These tools generate native code, so we want to stick with public
versions.

Bug: 452971335
Change-Id: I35867901dd38cc73e213657798da09b58e783b97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7069592
Reviewed-by: Sam Maier <smaier@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1533645}
NOKEYCHECK=True
GitOrigin-RevId: bcc07eb96d9d599bbe2bffef5b98eb13002f2f48