linaro_swr: Make it a 64bit only build target am: ab68f0ee84 am: e6fe95e2cb

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2785579

Change-Id: I67048f6d5c78c7108fb4b054fb5b4a5eef751540
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>