[coreboot-gerrit] Patch merged into coreboot/master: acpi/tpm: Gracefully handle missing TPM module.

the following patch was just integrated into master:
commit 85a255fbd89aba7edea7ac1d09c39099d53f7c44
Author: Tobias Diedrich 
Date:   Mon Feb 15 13:13:58 2016 +0100

acpi/tpm: Gracefully handle missing TPM module.

When TPM support is enabled, verify the TPM_DID_VID field is not
    all zeroes or all ones before returning 0xf in the _STA method.

This avoids these kernel errors when no module is installed:
    [    3.426426] tpm_tis 00:01: tpm_transmit: tpm_send: error -5
    [    3.432049] tpm_tis: probe of 00:01 failed with error -5

Change-Id: Ia089d4232e0986b3bc635d346e68d982e8aecd44
    Signed-off-by: Tobias Diedrich 
    Reviewed-on: https://review.coreboot.org/13713
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Duncan Laurie

See https://review.coreboot.org/13713 for details.

-gerrit