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tpm2: Save key and hash contexts using ANY_OBJECT_Marshal

Save key and hash contexts using the ANY_OBJECT_Marshal function and try
to load it using ANY_OBJECT_Unmarshal(). Unfortunately older contexts were
written out as plain OBJECTs, so we have to accomodate this case as well
so that we can restore key contexts from libtpms-0.7.x. We do not support
resuming HASH contexts from libtpms-0.7.x.

Before this modification context files written out by the IBM TSS stack
were 2692 bytes independent of content. Now an RSA 2048 key is 1222 bytes
and a NIST p384 key is 982 bytes.

Several of the original TPM 2 function exporting Sequence state and
importing it can now be disabled.

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

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