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Add constants, structures and build definition for the
new standard SMCCC PCI conduit. These are documented
in DEN0115A.

https://developer.arm.com/documentation/den0115/latest

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Change-Id: If667800a26b9ae88626e8d895674c9c2e8c09658