handle don't care regions in the system image

The system partitions has regions that we shouldn't write and can't
depend on the contents of.  Adds a new script to generate a map of
these regions (using the sparse image as input), and include the map
in the package zip so it can be used when writing or patching the
system partition.

Also fixes a bug where the wrong SELinux file contexts are used when
generating incrementals.

Change-Id: Iaca5b967a3b7d1df843c7c21becc19b3f1633dad