sdm: Don't report color modes for SDR Monitor

- Remove reporting sRGB color mode for SDR monitor.
- If a display doesn't have any color modes the clients will
  consider that only one mode(NATIVE) is supported.
- Add hal_native mode to the HDR monitor.

Change-Id: I153219a883d324d96a6ee998fa1799295409b523
Crs-fixed: 2344413
1 file changed