[PATCH 2/2] efi: Add basic EFI_TCG2_PROTOCOL support

[Ilias Apalodimas]

Hi Heinrich 
> > 
[...]
> > Why are we using COMMAND_BUFFER_SIZE throughout the TPM code if the
> > required buffer size for commands and responses can be read from the TPM
> > device?
> 
> I think the logic is that 256b is enough for the basic commands we needed.
> I can change that here. Get the TPM response during efi_tcg2_register() and use that 
> for the rest of the code?

A clarification is needed here, which I forgot on my initial response.
The tpm library in U-boot is using the same buffer and length.
That's the reason I used the same response buffer size. The reply is copied from the
internal buffer defined in tpm2_get_capability() to our response buffer.
So unless we change the TPM internals changing the EFI part will make no difference.
That being said I don't mind changing the EFI code since it will be future-proof, against 
the tpm code changes. Thoughts?

Regards
/Ilias