Add attributes for exported properties

This introduces some attributes that can be used to restrict access to
exported properties so that one can easily check from which the
properties can be accessed, and that OEMs can extend their own exported
properties.

Bug: 71814576
Bug: 131162102
Test: boot aosp_cf_x86_phone-userdebug
Test: logcat | grep "avc: "
Change-Id: I6f988ec1cb94fa64563ca6cb91b7702da5d604e3
3 files changed