Change in coreboot[master]: soc/intel/common/block/uart: rework to use dummy device

[Michael Niewöhner (Code Review)]

Hello  Felix Singer, build bot (Jenkins), Nico Huber, Furquan Shaikh, Tim Wawrzynczak, Paul Menzel, Duncan Laurie, Patrick Rudolph,

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

https://review.coreboot.org/c/coreboot/+/48385

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

Change subject: soc/intel/common/block/uart: rework to use dummy device
......................................................................

soc/intel/common/block/uart: rework to use dummy device

This change reorganizes the uart chip driver to use a dummy device
instead of wrapping the actual UART controller by the chip. This is done
to make the organization of the UART PCI device in the devicetree
consistent with all the other internal PCI devices of the SoC i.e.
without a chip around the PCI device.

Thus, with this change, UART entry in devicetrees can be changed from:
```
chip soc/intel/common/block/uart
    device pci xx.y hidden
    register "devid" = "PCI_DEVICE_ID_INTEL_XXX_UART2"
end # UART #2, in ACPI mode
```

to:

```
device pci xx.y hidden
        chip soc/intel/common/block/uart
    	register "devid" = "PCI_DEVICE_ID_INTEL_XXX_UART2"
                device generic 0 on end # Dummy UART device
        end
end # UART #2, in ACPI mode
```

This change also corrects the devicetree of the only board currently
using this driver, prodrive/hermes.

Change-Id: Ic9c9398829b52e6b0523504b862aae9aff559bc7
Signed-off-by: Felix Singer 
Signed-off-by: Michael Niewöhner 
---
M src/mainboard/prodrive/hermes/variants/baseboard/overridetree.cb
M src/soc/intel/common/block/uart/uart.c
2 files changed, 38 insertions(+), 21 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/48385/3