new unsupported request common error

A common use case is where an interface or property does not support all
of the possible options to it. Create a common error for these
scenarios.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I36b09f73adfed9244976ce21c70d02bae61bba01
diff --git a/xyz/openbmc_project/Common.errors.yaml b/xyz/openbmc_project/Common.errors.yaml
index 288aa7c..c59f7fc 100644
--- a/xyz/openbmc_project/Common.errors.yaml
+++ b/xyz/openbmc_project/Common.errors.yaml
@@ -16,3 +16,5 @@
   description: The resource is not found.
 - name: Unavailable
   description: The service is temporarily unavailable.
+- name: UnsupportedRequest
+  description: The request is unsupported.