ToneGenerator: add tones for New Zealand

Add definitions for region specific supervisory tones for New Zealand:
- Dial Tone : 400 Hz, continuous
- Busy Tone : 400 Hz, [500ms on, 500ms off] ...
- Call Waiting Tone : 400 Hz, [200ms on, 3 sec off] x 4
- Ringing / RBT : 400 Hz + 450 Hz, [400ms on, 200ms off, 400ms on, 2000ms off] ...

Bug: 227412820
Test: atest ToneGeneratorTest
Change-Id: I0d776f3fbdbba925cf1ac272270fb36f286dff91
Merged-In: I0d776f3fbdbba925cf1ac272270fb36f286dff91
(cherry picked from commit fb196969)