The servers do not have ImageMagick installed right now,
breaking the automated builds.
Revert this for now.
This reverts the following commits:
840e781408 bootanim: Use a for loop to make part# folders
ce5405d1f7 Fix wrong bootanimation.zip from mkdir .../part{0..2}
6179d9494f cm: Build bootanimation.zip
67ddf37281 cm: Rework boot animation generation
Change-Id: I63fc43da9b1a6afea5f791e879f0bfc9a385d98d
This allows projects to opt out for space limited devices.
Also create a common_mini.mk and populate it with common stuff from
the common_mini_*.mk files.
Change-Id: I7d7dee73b70f97a778353ca136434a6e36edaf7e