EventHub: improve error message when populating axis states

The old wording was a little unusual ("absolute controller"?), and
reporting the axis name makes it a bit clearer what's going on.

Bug: 245989146
Test: cause errors by quickly creating and removing a device (see
      b/424789999#comment10) and check the error logs
Flag: EXEMPT log only update
Change-Id: Ie5069b8dd3b8e6523befa720c02db20d8f237fd1