gralloc: fuzz libgralloctypes

Libgralloctypes decodes byte streams from remote processes. This
fuzzer fuzzes all of libgralloctypes decode functions to make
sure there aren't any vulnerabilites.

This patch borrows heavily from binder_parcel_fuzzer.

Bug: 141632767
Test: SANITIZE_HOST=address make libgralloctypes_fuzzer
      ${ANDROID_HOST_OUT}/fuzz/<arch>/libgralloctypes_fuzzer/libgralloctypes_fuzzer

Change-Id: I24e01570ac79f47cad1eff2eb68cb70201a4644d