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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feat(tpm): add tpm drivers and framework

Add tpm2 drivers to tf-a with adequate framework
-implement a fifo spi interface that works
with discrete tpm chip.
-implement tpm command layer interfaces

feat(tpm): add tpm drivers and framework

Add tpm2 drivers to tf-a with adequate framework
-implement a fifo spi interface that works
with discrete tpm chip.
-implement tpm command layer interfaces that are used
to initialize, start and make measurements and
close the interface.
-tpm drivers are built using their own make file
to allow for ease in porting across platforms,
and across different interfaces.

Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Signed-off-by: Abhi Singh <abhi.singh@arm.com>
Change-Id: Ie1a189f45c80f26f4dea16c3bd71b1503709e0ea

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