Remove custom timestamp from hw/libhw/input

These are no longer used by EventHub, and should not be carried forward.

Bug: 116601048
Test: presubmit only
Merged-In: I35129484d9945dcd4d291e0f2fac894e07c53c04
Change-Id: I35129484d9945dcd4d291e0f2fac894e07c53c04
3 files changed