investigate tpm2 lib fuzzing

[mxu9]

https://github.com/google/oss-fuzz/tree/master/projects/ibmswtpm2

Here is a patch that adds a libfuzzer driver for the tpm command interface and enables a handful of sanitizers. Just compile with ./configure --enable-fuzzer. Additional drivers can be added for the other TPM interfaces in a similar fashion.
0001-Add-libfuzzer-driver-for-TPM-CMD-interface.patch