recovery: install product_file_contexts and product_property_contexts

Product partition is not mounted in recovery mode. Install
product_file_contexts and product_property_contexts into rootdir for
recovery. This is similar to how we deal with system, vendor, and odm
*_contexts files.

And remove unnecessary ifdefs.

Test: m bootimage for pixel 3, product_file_contexts and
product_property_contexts appear in $OUT/recovery/root/
Change-Id: I416d9e6ea742e67a6fe294f1ad8b78fb9b844260