Camera: Extend the HEIF UltraHDR format muxing

- Insert 'tmap' within ftyp in case a gainmap
  is present
- Avoid adding prefixes when writing the gainmap
  metadata
- Switch to using the HEIF UltraHDR dataspace AIDL definition

Flag: com.android.internal.camera.flags.camera_heif_gainmap
Bug: 362608343
Test: atest -c -d cts/tests/camera/src/android/hardware/camera2/cts/ImageReaderTest.java#testHeicUltraHdr

Change-Id: I99ae2cf553923e4a1b9994a6c2148959786db359