tpm: TPM 2.0 commands

This patch contains the following internal helper functions for
tpm.ko:

- tpm2_get_random()
- tpm2_get_tpm_pt()
- tpm2_pcr_extend()
- tpm2_pcr_read()
- tpm2_startup()

and the following exported functions for implementing new device
drivers:

- tpm2_do_selftest()
- tpm2_calc_ordinal_durations()
- tpm2_gen_interrupt()

Functions that are defined in include/linux/tpm.h and tpm_transmit()
use TPM2 commands for TPM2 chips.

Added a new field "flags" to struct tpm_chip and enum tpm_chip_flags.
TPM2 chips can set TPM_CHIP_FLAG_TPM2 after tpm_chip_alloc() to
enable TPM2 commands.

The code for tpm2_gen_interrupt(), tpm2_calc_ordinal_duration()
and tpm2_startup() is derived from the code originally made by
Will Arthur.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Will Arthur <will.c.arthur@intel.com>
tpm: TPM 2.0 sysfs attributes

Implemented sysfs attributes for TPM2 devices.

Documentation/ABI/stable/sysfs-class/tpm2 contains descriptions
of these attributes.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
tpm: TPM 2.0 CRB Interface

tpm_crb is a driver for TPM 2.0 Command Response Buffer (CRB) Interface
as defined in PC Client Platform TPM Profile (PTP) Specification.

Only polling and single locality is supported as these are the limitations
of the available hardware, Platform Trust Techonlogy (PTT) in Haswell
CPUs.

The driver always applies CRB with ACPI start because PTT reports using
only ACPI start as start method but as a result of my testing it requires
also CRB start.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
tpm: TPM 2.0 FIFO Interface

Detect TPM 2.0 by using the extended STS (STS3) register. For TPM 2.0,
instead of calling tpm_get_timeouts(), assign duration and timeout
values defined in the TPM 2.0 PTP specification.

Signed-off-by: Will Arthur <will.c.arthur@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>