[Composer-VTS] Check minFrameIntervalNs to check if rate is changing

With different VRR modes we may have 2 modes with
exactly the same minFrameIntervalNs, and in this case we can't
differentiate between 2 modes.

Test: atest VtsHalGraphicsComposer3_TargetTest
BUG: 328350178
Change-Id: I5cddfee8b789ed6ce1b223ec345175f19a0db091
2 files changed