Allow devices to specify certain ro. props via TARGET_INIT_VENDOR_LIB
originally from @dhacker29
https://github.com/TEAM-Gummy/android_build/commit/5b8ac251281623368e65a6997c2e60e617c95d12
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: Iaaef0fad2fc1a5e670958d68d47751291b6e6c24
Signed-off-by: cj360 <ayunker551@gmail.com>