[SF] Use Render rate for Refresh rate

When VRR device does not support refresh rate debug indicator callback
Use the render rate as the refresh rate on the indicator.

Test: Manually tested refresh rate indicator on device that supports the
callback and device that doesn't
BUG: 326137213

Change-Id: Ifd0d34909b831991d4525f2b5138e71e4a76c4d6