Rename the arguments of tcg2_get_pcr_info() to clarify
they are bank masks, not PCR mask.
Remove the unused local variable.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

This function was used on measured boot to retrieve the number of active
PCR banks and was designed to work with the TCG protocols.
Since we now have the need to retrieve the active PCRs outside the
measured boot context -- e.g use the in the command line, decouple the
function.

Create one that will only adheres to TCG TSS2.0 [0] specification called
tpm2_get_pcr_info() which can be used by the TPM2.0 APIs and a new one that
is called from the measured boot context called tcg2_get_pcr_info()

[0] https://trustedcomputinggroup.org/wp-content/uploads/TSS_Overview_Common_Structures_Version-0.9_Revision-03_Review_030918.pdf

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

The previous patch is moving the TPM TCG headers in their own file for
a cleaner API. Move the functions in their own file as well.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

commit 97707f12fdab ("tpm: Support boot measurements") moved out code
from the EFI subsystem into the TPM one to support measurements when
booting with !EFI.

Those were moved directly into the TPM subsystem and in the tpm-v2.c
library. In hindsight, it would have been better to move it in new
files since the TCG2 is governed by its own spec, it's overeall cleaner
and also easier to enable certain parts of the TPM functionality.

So let's start moving the headers in a new file containing the TCG
specific bits.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>