Merge changes from topic "dtpm_poc" into integration

* changes:
feat(docs): update mboot threat model with dTPM
docs(tpm): add design documentation for dTPM
fix(rpi3): expose BL1_RW to BL2 ma

Merge changes from topic "dtpm_poc" into integration

* changes:
feat(docs): update mboot threat model with dTPM
docs(tpm): add design documentation for dTPM
fix(rpi3): expose BL1_RW to BL2 map for mboot
feat(rpi3): add dTPM backed measured boot
feat(tpm): add Infineon SLB9670 GPIO SPI config
feat(tpm): add tpm drivers and framework
feat(io): add generic gpio spi bit-bang driver
feat(rpi3): implement eventlog handoff to BL33
feat(rpi3): implement mboot for rpi3

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docs(tpm): add design documentation for dTPM

-documentation for Discrete TPM drivers.
-documentation for a proof of concept on rpi3;
Measured Boot using Discrete TPM.

Signed-off-by: Abhi Singh <ab

docs(tpm): add design documentation for dTPM

-documentation for Discrete TPM drivers.
-documentation for a proof of concept on rpi3;
Measured Boot using Discrete TPM.

Signed-off-by: Abhi Singh <abhi.singh@arm.com>
Change-Id: If8e7c14a1c0b9776af872104aceeff21a13bd821

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