TouchInputMapper: Remove the concept of coverage calibration

Coverage calibration assumes the overloaded use of certain touch
protocol axes, and was added as a workaround for a specific device.
Since it is no longer being used, it can be removed.

Bug: 260869755
Test: atest inputflinger_tests
Change-Id: If7b0026a2c55672d6a3141cf29ce442e9e92dc75