Make maximum sensor fusion rate tunable.

Instead of the hard-coded 200Hz maximum rate limit for sensor fusion,
make it a tunable parameter using a property:
sensors.aosp_low_power_sensor_fusion.maximum_rate
If the property is not specified, the default remains 200Hz.
Wearable devices are recommended to change it to 100 (Hz) to
save power.

Bug: b/270230642
Test: dumpsys sensorservice and verify gyro-rate

Change-Id: Iff07899b80366d6a9913529d5758f386848c9697