Rename sequenceNum to ID.

This is for consistency with ID in other places. Change it to signed
type to match Java int type.

Bug: 144889238
Test: atest inputflinger_tests
Change-Id: I8b6782a67f28aa13f7feaed2c97b8e87105019db
Merged-In: I8b6782a67f28aa13f7feaed2c97b8e87105019db
(cherry picked from commit 6a5a14e75b1a0fb377c670cb9a1e9ace60c5da74)
20 files changed