Avoid calling into HWC in onFirstRef

The information is already available - no need to call into HWC.

This saved around 150-200us per onFirstRef call.

Test: atest UiAutomationTest#testWindowContentFrameStats
Test: PerfTransitionTest
Test: LayerTypeTransactionTest#RefreshRateIsInitialized
Bug: 112352758
Change-Id: I406754d33d53d6c60e354f5a403f1d5568f714c4