Ensuring the right HDR icon is shown on camera switch (camera-haleakala)

- When switching cameras HDR+ icon was always shown in disabled state regardless of the actual support mode
- Existing boolean setting to track device's HDR support is not enough
- Changing global device's HDR support setting to string that can hold no-hdr, hdr or hdr-plus values

Bug: 21037428
Change-Id: Ia9cf0484879a22a27e4deb0e4aa066ec806a43e6
4 files changed