Change in coreboot[master]: drivers/pcie/generic: Add new pcie generic chip driver

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Subrata Banik, Tim Wawrzynczak, Angel Pons.
Hello build bot (Jenkins), Subrata Banik, Angel Pons, Nick Vaccaro,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/61627

to look at the new patch set (#3).

Change subject: drivers/pcie/generic: Add new pcie generic chip driver
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drivers/pcie/generic: Add new pcie generic chip driver

This new chip driver will be used for attaching ACPI properties to PCIe
endpoints. The first property it supports is "UntrustedDevice." This
property can be used by a payload to, e.g., restrict the device to its
own IOMMU domain for security purposes. The new property is added by
adding a _DSD and an integer property set to 1.

Example of the property from google/brya0:

Scope (_SB.PCI0.RP01)
{
    Device (DEV0)
    {
        Name (_ADR, 0x0000000000000000)  // _ADR: Address
        Name (_DSD, Package (0x02)  // _DSD: Device-Specific Data
        {
            ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
            Package (0x01)
            {
                Package (0x02)
                {
                    "UntrustedDevice",
                    One
                }
            }
        })
    }
}

BUG=b:215424986
TEST=boot patch train on google/brya0, dump SSDT, see above for snippet

Signed-off-by: Tim Wawrzynczak 
Change-Id: I53986614dcbf4d10a6bb4010e131f5ff5a9d25cf
---
A src/drivers/pcie/generic/Kconfig
A src/drivers/pcie/generic/Makefile.inc
A src/drivers/pcie/generic/chip.h
A src/drivers/pcie/generic/generic.c
4 files changed, 87 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/27/61627/3