Renaming Frequency Profile APIs

To prepare for the implementation of PWLE v2, which requires a new FrequencyProfile, we're renaming the existing profile to avoid naming conflicts:
- VibratorFrequencyProfile -> VibratorFrequencyProfileLegacy
- VibratorInfo.FrequencyProfile -> VibratorInfo.FrequencyProfileLegacy

The legacy APIs were never made part of the public API, so this renaming
should not affect external developers.

Bug: 347034419
Flag: android.os.vibrator.normalized_pwle_effects
Test: atest FrameworksVibratorCoreTests
Change-Id: I57bd2768d1253537a4a7cfeef00f111fa3989457