Merge "Reserve space in super for dynamic partition metadata" am: 115a70409f am: 42ae98c3bf am: 7c257e8c98

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1645947

Change-Id: I3391328eb68d4089d1b90114f1ae70057e0d5aac