Merge "Generate partial ota update package if the board defines it" am:...

Merge "Generate partial ota update package if the board defines it" am: f6923467 am: 8d70b612 am: 3b2ec594 am: b03077c1

Original change: https://android-review.googlesource.com/c/platform/build/+/1464827

Change-Id: I80a955404a80eb67f406b7b8756a83ae2518a6e5