SF: Per-display GlobalSignals for SchedulerTest

GlobalSignals fields have changed in granularity with the
follower_arbitrary_refresh_rate_selection flag enabled. Idle and power
are per-display now while touch is for all displays (vs just the
internal).

This CL fixes SchedulerTest#chooseDisplayModesMultipleDisplays, which
has assumptions regarding GlobalSignals and global timers baked into
the expectations.

Bug: 371584290
Flag: EXEMPT TEST_ONLY
Test: atest SchedulerTest#chooseDisplayModesMultipleDisplays w&w/o flag
Change-Id: Ief0c6ff81c2cb5e9fb9a11d5e45c5ec490a823d1