tss: implement tlcl_save_state

When an untrusted OS is running, we would like to use the Cr50
vendor-specific VENDOR_CC_TPM_MODE command to disable TPM.
Before doing this, we should save TPM state.  Implement
tlcl_save_state for this purpose.

This needs to live in coreboot codebase since on S3 resume path,
depthcharge is not reached.

Implement the function in both tcg-1.2 and tcg-2.0 for
completeness.

BUG=b:70681930,b:118202153
TEST=hack a call to tlcl_save_state into coreboot on S3 resume
     verify in AP console that it is called

Signed-off-by: Joel Kitching <kitching@google.com>
Change-Id: I8b51ca68456fc9b655e4dc2d0958b7c040d50510
Reviewed-on: https://review.coreboot.org/c/29646
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

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