Change jsonVariationMap to array of struct am: 8097d1a0e6 am: 465668494e am: b753906270 am: 353186f043 am: bb15015143

Original change: https://android-review.googlesource.com/c/platform/build/blueprint/+/2059708

Change-Id: I5d0bdec9cde422dc73bc660c8a17349ff09d5ff3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>