Add xyz.openbmc_project.Console.UART

Formalize an ad-hoc interface currently implemented in obmc-console.
This will contain attributes for each console object that is connected
to a physical UART. Other console objects (e.g. VUART) would not
implement this interface. could be extended to support additional
console attributes, but for now a writable `Baud` property is the only
item.

Change-Id: Ib4c9f1e24b4843281c222e882586a0fd44af723b
Signed-off-by: Jonathan Doman <jonathan.doman@intel.com>
diff --git a/yaml/xyz/openbmc_project/Console/UART.interface.yaml b/yaml/xyz/openbmc_project/Console/UART.interface.yaml
new file mode 100644
index 0000000..e30c443
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Console/UART.interface.yaml
@@ -0,0 +1,6 @@
+description: Serial console configuration.
+
+properties:
+    - name: Baud
+      type: uint64
+      description: Data transmission rate of the serial console.