tpm2: refactor session header marshalling

For coreboot TPM2 the use case session header is always the minimal
possible size, the only difference is that some commands require one
and some require two handles.

Refactor common session header marshalling code into a separate
function.  This will be useful when more commands marshalling code is
added.

BRANCH=none
BUG=chrome-os-partner:50645
TEST=flashed the TPM and rebooted the device a few times, it
     successfully loaded chrome os on every attempt.

Change-Id: I9b1697c44f67aab32b9cd556b559a55d5050be06
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: a97a7fa16ceeb484e90e2e1f0573e58a468350b2
Original-Change-Id: I86e6426be5200f28ebb2174b418254018e81da8e
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/357972
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15633
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>

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