Remove the "provision" shell function from envsetup.sh am: d4e29a4b am: 5875b3f0

Original change: https://android-review.googlesource.com/c/platform/build/+/3103318



Change-Id: I51145999fc5b0658d6541d08fb572a3f803606bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>