tpm: Implement tpm20_startup and tpm20_s3_resume

tpm: Implement tpm20_startup and tpm20_s3_resume

Implement tpm20_startup and tpm20_s3_resume and their dependencies.

We follow this specification:

TCG PC Client Specific Platform Firmware Profile for TPM 2.0 Systems Revision 1.0 Version 21

It can be found on this page:

http://www.trustedcomputinggroup.org/resources/specifications_in_public_review

Power on: Figure 7 & 7.3.2 item 4.
S3: Figure 9 & 7.3.2 item 4.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>