Revert to stock in prep for refactoring

Bring the diskinstaller back to unmodified AOSP stock to prepare for
refactoring the SVMP VM build targets as well as adding a bunch of new
ones.

This reverts commit 44fd8f7aa3ea2a60e000a6860f3ca1c66144613d.
This reverts commit bf21bcf9cb766aa8bf774bc57573139508d3c2e2.

Change-Id: Ic90103e5672e350f096daf91d867ac03d17fd11c
Move SVMP image build rules to device tree

Moved all of the SVMP-specific image build rules into a makefile stored
in the device/mitre/svmp tree. Now the only change here in config.mk is
to include the rest of the rules from the device tree. Also moved the
disk image layout configs there too.

Change-Id: I67f56755fe81fdf5d71865b77b9244704c2aa571