Revert^2 "Introducing Display Sythetic modes - used for app request refresh...

Revert^2 "Introducing Display Sythetic modes - used for app request refresh rate/resolution selection"

This reverts commit caa86a7c.

Reason for revert: reintroducing changes with robolectric test fix.
Robolectric ShadowDisplayManager only sets supportedModes when creating virtual display.
For internal tests that use modes direclty exposing system supportedModes

Bug: b/338183249
Flag: com.android.server.display.feature.flags.enable_synthetic_60hz_modes
Test: atest DisplayServiceTests, ABTD test run

Change-Id: Ied98a92947a3ef8af9fb3cdcc7cd74e0c183186c