Add selinux policies for init script and shell script to unzip a tar
containing ASAN libraries on boot.

Bug: 36458146
Test: m && m SANITIZE_TARGET=address
Test: manual (build steps for tar missing)
Change-Id: I5c3cb233aae93ee9985431090af902b0e3c1b0a7
(cherry picked from commit 0b743050)
Merged-In: I5c3cb233aae93ee9985431090af902b0e3c1b0a7