domain: grant all domains access to zoneinfo

/data/misc/zoneinfo is provided by libc and is considered to be
VNDK stable. Grant read access to all domains and exempt from
neverallow rules asserting no vendor access to core data types.

Bug: 36730929
Test: Marlin Policy builds
Change-Id: I13766a661d6314f5393639fc20f1ab55d802f35f