soc/amd/common/block/acpi/ivrs: conditionally generate eMMC entry

The eMMC entry in the IVRS table should only be generated if an eMMC
controller is present in the SoC.

Where the PCI_DEVFN(0x13, 1) is from is currently unclear to me. There
is no PCI device 0x13 on bus 0 and the eMMC controller is also an MMIO
device and not a PCI device, but this is what the reference code does.
My guess would be that it mainly needs to be a unique PCI device that
won't collide with any existing PCI device in the SoC. Add a comment
about this too.

TEST=None

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I00865cb7caf82547e89eb5e77817e3d8ca5d35dd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75933
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

0 files changed, 0 insertions, 0 deletions