Fixing DisplayTest for VRR display

VRR displays might have multiple modes differ only by vsync - switching between them will be transparent for apps
Also VRR displays might have synthetic modes- that only limit render rate

Bug: b/353140052
Test: atest DisplayTest#testModeSwitchOnPrimaryDisplay
Flag: EXEMPT bugfix
Change-Id: I02eed4a2f0a11b2d048af36af1ac929f91a12d93
1 file changed