inputflinger: fix format of parameter name comments

The Google C++ style guide [0] suggests that parameter name comments
should be of the form `/*paramName=*/value`. This potentially allows
tooling to check that the parameter names are correct, too.

[0]: https://google.github.io/styleguide/cppguide.html#Function_Argument_Comments

Bug: 245989146
Test: presubmit
Change-Id: I6239599692ada74438ebd8141adc05afacec915d