SF: fix layer activation with scheduler

When a layer frame rate vote changes (via setFrameRate call),
the layers needs to be activated in scheduler. This change fixes a
bug that was activating all layers instead of just the layers that
has a vote change

Bug: 163079696
Bug: 180014293
Test: run a test app that calls setFrameRate
Change-Id: Iaa538d04c535b185161a24a4bbadeff2ac99bcd8