Autogenerate a vendor-build.prop for the current product

The autogenerated soong vendor.img will use the autogenerated soong
vendor-build.prop module. The autogenerated vendor-build.prop module is
missing support for `android-info.txt` which is an additional input as
--prop-files. Support for that will be added in a followup CL.

Test: verified that autogenerated vendor.img for aosp_cf_x86_64_phone
contains a build.prop file, and its contents are equivalent to kati
built vendor build.prop file

Bug: 375500423
Change-Id: I46b3c2e7cf44300820dcd2f7a9799ad11730691e