Added fuzz targets for libkeystore-attestation-application-id

This patch adds following fuzz
targets: keystoreSignature_fuzzer, keystorePackageInfo_fuzzer,
keystoreApplicationId_fuzzer and keystoreAttestationId_fuzzer.

Test: ./keystoreSignature_fuzzer
Test: ./keystorePackageInfo_fuzzer
Test: ./keystoreApplicationId-fuzzer
Test: ./keystoreAttestationId_fuzzer
Bug: 187131475

Change-Id: I129a577208624b32a3eea24e877995828922acbb
7 files changed