[VRR] Change the velocity-to-frame rate mapping

Fixes: 355649437

Flag: EXEMPT bugfix

Internal testers with great eyes for smooth experiences have
given feedback on improving the mapping of velocity to frame rate.

Test: adjusted tests, new tests
Change-Id: Ifc35eabf3fbf583a6b966e3f667f45d0b15f04d0
2 files changed