Updates the hvac fragment of the Kitchen Sink app.

- Adds buttons for changing the temperature on both sides.
- Adds a button for toggling hvac power.
- Adds a button for toggling auto air recirculation.
- Adds a button for toggling the temperature display unit.
- Adds a button for turning on hvac power and AC simultaneously.
- Catches exceptions thrown when hvac power is off.

Bug: b/122315157
Test: Use the hvac fragment
Change-Id: I16e619cda0b2114c70c8cb1fc31030f560d52c70
(cherry picked from commit 2af6aff53e83ef4043786addac4c6ad1ae086177)
3 files changed