emulator: Roll the android-15 avd proto to prod

Roll the android-15 avd with updated system image
version r8(AE3A.240806.005) to prod. This is a follow
up CL to https://crrev.com/c/5826889

Bug: 337112189
Change-Id: Ie016dbce2e5d5015134cc309e30883775629421c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5829806


Commit-Queue: Renuga Nanjappan <rnanjappan@chromium.org>
Reviewed-by: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/main@{#1349484}