Add TPM2_GetTime Implementation #409
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See section 18.7 of the spec
This is a useful command as it allows you to "tick stamp" arbitrary data, associating it with both with a signing key and a particular TPM clock state. Separately calling the TPM2_ReadClock/TPM2_Sign commands can not accomplish this.
The command code for TPM2_GetTime is enumerated in constants.go but the actual command implementation does not exist, so this PR adds it.