[RFC/RFT] KEYS: trusted: Add generic trusted keys framework

[Jarkko Sakkinen]

On Fri, Jul 05, 2019 at 08:02:34PM +0530, Sumit Garg wrote:
> Current trusted keys framework is tightly coupled to use TPM device as
> an underlying implementation which makes it difficult for implementations
> like Trusted Execution Environment (TEE) etc. to provide trusked keys
> support in case platform doesn't posses a TPM device.
> 
> So this patch tries to add generic trusted keys framework where underlying
> implemtations like TPM, TEE etc. could be easily plugged-in.
> 
> Suggested-by: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>

1. Needs to be somehow dissected into digestable/reviewable pieces.
2. As a precursory step probably would make sense to move all
   existing trusted keys code into one subsystem first.

/Jarkko