Add tz files to the runtime module permissions

Code in bionic / libcore will now look in the runtime
APEX module for data files.

Bug: 119293618
Bug: 119390260
Test: build / treehugger only
Change-Id: I965c763e7f0452b8ef5ffbf730733e9a41254beb

apex/com.android.runtime.debug-file_contexts

@@ -6,3 +6,4 @@
 /bin/dexoptanalyzer(d)?  u:object_r:dexoptanalyzer_exec:s0
 /bin/profman(d)?         u:object_r:profman_exec:s0
 /lib(64)?(/.*)?          u:object_r:system_lib_file:s0
+/etc/tz(/.*)?            u:object_r:system_zoneinfo_file:s0

apex/com.android.runtime.release-file_contexts

@@ -6,3 +6,4 @@
 /bin/dexoptanalyzer      u:object_r:dexoptanalyzer_exec:s0
 /bin/profman             u:object_r:profman_exec:s0
 /lib(64)?(/.*)?          u:object_r:system_lib_file:s0
+/etc/tz(/.*)?            u:object_r:system_zoneinfo_file:s0