Recipes for installing fan zone yaml

Provides the virtual/phosphor-fan-control-zone-config virtual.

By default, it will install an empty zones.yaml file into the
directory needed by the phosphor-fan-control compile.

To provide a system specific fan zone yaml, put one in that system's
layer and install it with a .bbappend, which is what is being done
in this commit for Witherspoon.

Change-Id: Ie58fc9eb7b39cecffa39905266542bae16c0f977
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/common/recipes-phosphor/fans/phosphor-fan-control-zone-config/zones.yaml b/common/recipes-phosphor/fans/phosphor-fan-control-zone-config/zones.yaml
new file mode 100644
index 0000000..d25803c
--- /dev/null
+++ b/common/recipes-phosphor/fans/phosphor-fan-control-zone-config/zones.yaml
@@ -0,0 +1,2 @@
+#Default fan zone definition YAML - empty.
+#For format, see documentation in fan control code repository example yaml.