libhwc2.1: set min vrefresh to 1 for doze mode

- Set min vrefresh to 1 while entering doze mode
- Restore the original value while exiting doze mode

Bug: 335004301
Test: dump SurfaceFlinger
Change-Id: I71e802b14979afa9ee01484718c7fa2f71faa55d
2 files changed