Allow devices to specify certain ro. props via TARGET_UNIFIED_DEVICE

This modifies buildinfo.sh to not set model, name, description, and
fingerprint in build.prop. These can then be set via custom init
lib.
This also fixes ota_from_target_files to function without these
props being preset.

Change-Id: I945b2c38e60b207d2d0f82b34f4f230ac21b0657
[HAX] Allow per-target dtbTool

 * Revert this when fixed

Change-Id: I97ecb0448ae7bd5859454be290c5dde6248b2859
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_build into HEAD

Conflicts:
	core/Makefile

Change-Id: I30e5ea8d196d12456ef1b1fdb3e38050f46a8858