Remove startWaveformEffect APIs

We're removing the `startWaveformEffect` APIs and exposing the `WaveformEnvelopeBuilder` instead. Setting initial frequency is now part of the builder and can be set using `setInitialFrequencyHz`.

Bug: 378969646
Flag: android.os.vibrator.normalized_pwle_effects
Test: atest FrameworksVibratorCoreTests
Change-Id: Icf741057e03f3fd5f2999aa27dcae0b395f8b1ea