SF: Move desired active mode management to DisplayDevice

SF would set the desired active mode on the specific DisplayDevice the
mode was requested and use it to swicth the active display mode.

Change-Id: Ib4f01ec63b2087ab2a81490051d1e029afc71854
Test: SF unit tests
Test: refresh rate switching is working on device with
more than one display
Bug: 187539899

Change-Id: Ie0e5ffe364f81775c2101ffd0cf2c596051947fa
Merged-In: Ie0e5ffe364f81775c2101ffd0cf2c596051947fa