sepolicy: allow shell to read/write traced prop

This is to fix the CTS failures given by the bugs below where devices
where traced is not enabled by default causes test failures.

(cherry picked from commit 673b4db77706abb51f75ebfe685cf0b7af40f634)

Bug: 78215159
Bug: 78347829
Change-Id: Ib0f6a1cdb770528dbbeb857368534ff5040e464e
5 files changed