tpm: don't return bool from update_timeouts

Set tpm_chip->timeouts_adjusted directly in the update_timeouts
code instead of returning bool. In case of tpm read failing
print warning that the read failed and continue on.

Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>