neverallow "write ops" on system_data_file from "others"

Only a few system level components should be creating and writing
these files, force a type transition for shared files.

Signed-off-by: William Roberts <william.c.roberts@linux.intel.com>
(cherry picked from commit 529a8634)

Change-Id: I9c4df4e332426e253dd6fcd4f8ea0348dc3a5f54
Bug: 21924438