Add atoms for display HBM metrics

Add atoms DisplayHbmStateChanged and DisplayHbmBrightnessChanged.

Bug: 202869195
Test: build pass
MDR: eldar/286549800
Change-Id: Ia8850eaa3dbb6470c8a5f6463dd943853feed5ef
2 files changed
tree: 3a20b101b842f15cbdc3b5dc04683c0f08f67484
  1. stats/
  2. OWNERS