Merge changes from topic "Arm_PCI_Config_Space_Interface" into integration

* changes:
TF-A: Document SMC_PCI_SUPPORT option
SMCCC/PCI: Handle std svc boilerplate
SMCCC/PCI: Add initial PCI con

Merge changes from topic "Arm_PCI_Config_Space_Interface" into integration

* changes:
TF-A: Document SMC_PCI_SUPPORT option
SMCCC/PCI: Handle std svc boilerplate
SMCCC/PCI: Add initial PCI conduit definitions
SMCCC: Hoist SMC_32 sanitization

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SMCCC/PCI: Handle std svc boilerplate

Add SMC wrappers for handshaking the existence
and basic parameter validation for the SMCCC/PCI
API. The actual read/write/segment validation is
implemented by

SMCCC/PCI: Handle std svc boilerplate

Add SMC wrappers for handshaking the existence
and basic parameter validation for the SMCCC/PCI
API. The actual read/write/segment validation is
implemented by a given platform which will enable
the API by defining SMC_PCI_SUPPORT.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Change-Id: I4485ad0fe6003cec6f5eedef688914d100513c21

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