Convert tool type to enum class

For better type safety, use enum class when sending tool type.

Bug: 198472780
Test: atest libinput_tests inputflinger_tests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:09a8fe42ba1d218c2f445e4fd5bc387e260ae067)
Merged-In: I371f08087b9513b6f75966c124de77bc12f8324e
Change-Id: I371f08087b9513b6f75966c124de77bc12f8324e
43 files changed