inputflinger_input_classifier_fuzzer: Bug Fix

Resolved signed integer overflow. A range for eventTime has been set to prevent integer overflow in the readTime variable

exec/sec: 7000
Test: ./inputflinger_input_classifier_fuzzer clusterfuzz-testcase-minimized-inputflinger_input_classifier_fuzzer-5773122447933440
Bug: 289471463

Change-Id: I5cff2468b81ac8dc2f0773638d13a0d7e25f7038
(cherry picked from commit 6f6c88f12f57633047b32ce98498367c40a4b891)