plugins/admin: add ServiceAllowList property
This adds code to register interface org.bluez.AdminPolicyStatus.
The interface will provide read-only properties to indicate the current
settings of admin policies. We separate this from AdminPolicySet so that
normal clients can check current policy settings while only a few
clients can change policies.
This patch also adds readonly property ServiceAllowlist to
AdminPolicyStatus1, which indicates the current setting of service
allowlist.
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>