[PATCH 0/2 v2] tpm: add update_durations class op to allow override of chip supplied values

[Jerry Snitselaar]

We've run into a case where a customer has an STM TPM 1.2 chip
(version 1.2.8.28) that is getting into an inconsistent state and
they end up getting tpm transmit errors.  In really old tpm code this
wasn't seen because the code that grabbed the duration values from the
chip could fail silently, and would proceed to just use default values
and move forward. More recent code though successfully gets the
duration values from the chip, and using those values this particular
chip version gets into the state seen by the customer.

The idea with this patchset is to provide a facility like the
update_timeouts operation to allow the override of chip supplied
values.

I went back and looked at the original submission thread, and updated
Alexey's patches based on Jarkko's suggestions for v2.