Doze: Don't block pickup pulses on a proximity check.

Pulse immediately, assuming the pickup sensor will not fire
if prox=near.  Perform a non-blocking additional proximity check
in these cases purely to collect verification diagnostics.

Also tweak the interpolator for pickup pulses to ramp up more
quickly.

Bug: 18373928
Change-Id: I8607f4b37435722e293db741c273914183cec7be