Add logging for MT_TOOL_PALM usage

Add some logs when we receive the palm event. That could help us to
understand if the device can receive palm event and the pointer cancel
is actually dispatched.

Bug: 161655782
Test: manual, enabled twoshay and check logs.
Change-Id: Ic8a8314473e42f8f35ca12f9dad18b7d92eb8622
2 files changed