[automerger skipped] Retire QEMU_USE_SYSTEM_EXT_PARTITIONS am: b790c9f1 -s ours

am skip reason: Merged-In Iace22e384976663a8b6e4d1c474c1e2d0f90ec74 with SHA-1 6715e763 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/22514522



Change-Id: I51f7b4dbec42a890dc3e5e6b582be614cb78134e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>