inputflinger_input_reader_fuzzer: Bug Fix

Resolved OOB read getting triggered due to FuzzedDataProvider's
shared_ptr which is used among different classes. Implemented
ThreadSafe instance of FuzzedDataProvider as bug-fix.

Test: ./inputflinger_input_reader_fuzzer clusterfuzz-testcase
-minimized-inputflinger_input_reader_fuzzer-6227827124207616
Test: ./inputflinger_input_reader_fuzzer clusterfuzz-testcase
-minimized-inputflinger_input_reader_fuzzer-5394273856782336

Bug: 253728999
Bug: 254590389

Change-Id: I42d53d1d7da18c8085d381c939bedf14fe18dc87
(cherry picked from commit 08aa517eee8e7cdf65bf0bd303239e25ed1d50e8)