soc/amd/common/data_fabric/domain: introduce add_pci_cfg_resources

Since reporting the PCI ECAM MMCONF MMIO region and the IO ports for the
legacy PCI config space access is needed on all AMD SoCs, implement a
common add_pci_cfg_resources function that reports both and gets called
from amd_pci_domain_read_resources and don't report those in the SoC-
specific code any more. The only functional change is that on Genoa now
the IO ports used for the legacy PCI config space access get reserved.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ibbcc2aea4f25b6dc68fdf7f360e5a4ce53f6d850
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/vendorcode/amd/opensil/genoa_poc/memmap.c

@@ -114,8 +114,6 @@ void add_opensil_memmap(struct device *dev, unsigned long *idx)
 	if (mem_usable != top_mem)
 		reserved_ram_from_to(dev, (*idx)++, mem_usable, top_mem);
 
-	mmconf_resource(dev, (*idx)++);
-
 	// Check if we're done
 	if (top_of_mem <= 0x100000000)
 		return;