More granular vendor access to /system files.

This change limits global access to /system files down to:
/system/bin/linker*
/system/lib[64]/*
/system/etc/ld.config*
/system/etc/seccomp_policy/*
/system/etc/security/cacerts/*
/system/usr/share/zoneinfo/*

Bug: 111243627
Test: boot device, browse internet without denials to system_* types.
Test: VtsHalDrmV1_{1, 0}TargetTest without denials
Change-Id: I69894b29733979c2bc944ac80229e84de5d519f4