Add a header value for configure max downlaod retry count am: 3cc4fa3842

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2235364

Change-Id: I8d27ae39e6fa6f8b72fa66c7e6caede28b433e12
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>