Moving "persist.traced.enable" to /product/build.prop

This property has a stable API so it can be moved to /product
partition. The interface between /product and /system should be
stable, but that between /system and /system_ext need not.

https://android-review.googlesource.com/c/platform/system/libsysprop/+/952375

Bug: 140788609
Test: build and checks /product/build.prop
Change-Id: I3545b22af9aaf4d7f51e88e626e73ac75ded78fc