Introduce flag to remove framework support for vibrator HIDL HALs

Android Q is now no longer supported for launching or upgrading
devices in Android V so the vibrator HIDL HAL no longer needs to be
supported by Android.

Introduce flag to guard the framework clean-up that covers removing
the code to support HIDL HAL versions.

Bug: 308452413
Flag: android.os.vibrator.remove_hidl_support
Test: N/A
Change-Id: I6a8664bc52e46ab3c7999eeaa41448fceda11626