Add supp service notification test intent.

Add new test intent used to manually trigger supp service notifications.
Since the call forwarded supp service notification is not something
that can be tested domestically, this test intent provides a means of
invoking the functionality.

Test: Test harness.
Bug: 33761801
Change-Id: Ic23a65c02e419587d1095d2c24b52df76fc14826