TouchpadInputMapper: remove usage atom log lines

Change Ifc06bdee240471692e8b3c4fc9b67a99d10d203d fixed the flakiness
that these logs were added to diagnose, so we don't need them anymore.

This is a pure revert of changes
I23346b4904f83abb6cc5a07b687bb0a9802c6bfa and
Ic062a5fe5db905c4691147a1267600981b9017e8.

Bug: 324047709
Test: m checkinput
Test: atest 'android.input.cts.hostside.InputAtomsTest#testTouchpadUsageAtom_FingerAndPalmCounts'
Flag: NONE trivial log removal / pure revert
Change-Id: I3114f7444fa40efd8c4ad080e28bbf11f00d1534