tpm: TPM 2.0 baseline support

TPM 2.0 devices are separated by adding a field 'flags' to struct
tpm_chip and defining a flag TPM_CHIP_FLAG_TPM2 for tagging them.

This patch adds the following internal functions:

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

Additionally, the following exported functions are implemented for
implementing TPM 2.0 device drivers:

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

The existing functions that are exported for the use for existing
subsystems have been changed to check the flags field in struct
tpm_chip and use appropriate TPM 2.0 counterpart if
TPM_CHIP_FLAG_TPM2 is est.

The code for tpm2_calc_ordinal_duration() and tpm2_startup() were
originally written by Will Arthur.

Signed-off-by: Jarkko Sakkinen <[email protected]>
Signed-off-by: Will Arthur <[email protected]>
Reviewed-by: Jasob Gunthorpe <[email protected]>
Reviewed-by: Stefan Berger <[email protected]>
Reviewed-by: Peter Huewe <[email protected]>
Tested-by: Peter Huewe <[email protected]>

[phuewe: Fixed copy paste error * 2]
Signed-off-by: Peter Huewe <[email protected]>

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