Add PowerSupplyRedundancy interface

Added the PowerSupplyRedundancy interface to be used to set the
redundancy of the power supplies.

Change-Id: I5394975963b79ae74ed7a6caf7a5bf48879f34ba
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/xyz/openbmc_project/Control/PowerSupplyRedundancy.interface.yaml b/xyz/openbmc_project/Control/PowerSupplyRedundancy.interface.yaml
new file mode 100644
index 0000000..b99d51b
--- /dev/null
+++ b/xyz/openbmc_project/Control/PowerSupplyRedundancy.interface.yaml
@@ -0,0 +1,7 @@
+description: >
+    An interface to set whether the power supplies are redundant.
+properties:
+    - name: PowerSupplyRedundancyEnabled
+      type: boolean
+      description: >
+          When true, the power supplies are redundant.