Camera: Improve monochrome camera capability support

- Add dummy CFA pattern for monochrome camera.
- Handle monochrome camera in DngCreator.
- Fix up static and dynamic metadata tags related to monochrome camera
for older version of devices.

Test: Camera CTS
Test: Capture a DNG file and inspect with LightRoom
Bug: 70216652
Change-Id: I68d2b3d77b7f81bdc9e4129c2a8af10a4f18db3b