Refine the recenter operation

This change allows recentering to happen for an individual sensor
rather than to all at once. This avoids unecessary recentering and
rate limiting if the sensor being recentered is not being used in the
current mode.

Test: atest --host libheadtracking-test
Bug: 188502620
Change-Id: Ifb73050e0072e676b5936a22e0cd1be8d31e9596