Add props files for each partition

The following files will be added.
- /vendor/default.prop for default prop overrides from vendor
 partition.
- /odm/default.prop for default prop overrides from odm partition.
- /odm/build.prop for build prop overrides from odm partition.

Test: tested default/build prop files with enabling early mount, but
didn't test files of odm partition because odm partition doesn't
exist now.
Bug: 34116668
Change-Id: Ia99895a0afcdc522463d95b2f3e2841dcf2e3516