More envsetup.sh cleanup -- move these to standalone scripts am: ded5d2de

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3101801



Change-Id: I9b6e428ad0fcbeb9fa22c0baf3a6cde52391a2f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>