Merge "Set download_tmp_dir explicitly to be a directory under the output...

Merge "Set download_tmp_dir explicitly to be a directory under the output directory." into main am: 67b49731

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2781987



Change-Id: Ib7c036acd04cbef3684818ae2b00b1af0a17e861
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>