Create product sysprops on vendor partition.

Duplicate essential product sysprops for manufacturer, model, brand, name, and device
from system on vendor so that mixed builds (vendor.img + GSI system.img) have correct
product information in their CTS/VTS reports.

Test: make
Bug: 64458205
Change-Id: Ib63b37772be493b9e035d9b7e8c5e2cf66f2fa8c