Build: add boot animation resizing and zipping scripts

ps2: real resize scripts, rather than the development one with echos and such to debug

Change-Id: I6ab9ba31c8549a3aec84c9321cf2d113399017c9
Generate extra userdata partition if needed

* To support variants of devices which may come in 16/32/64GB variants.

Change-Id: I74c32d8316f0450a1445fe95a95e5cabb7a9dd1b