Refactor chassisInterfaces into chassis_utils

Some (e.g. IBM) do not use the
`xyz.openbmc_project.Inventory.Item.Board` interface for chassis
objects. To handle the use pattern easier, this refactors the Chassis
interface into one location and it is referenced from the needed places
(e.g. `getValidChassisPath()`).

Moreover, this part is repeated many times, which goes against best
practices.

Tested:
- GET Chassis related API and check they are the same as before
- Redfish Service Validator passes

Change-Id: Id4a51986262892c5dc81b1a3bc46fa5be7c0e9da
Signed-off-by: Myung Bae <myungbae@us.ibm.com>
diff --git a/redfish-core/lib/sensors.hpp b/redfish-core/lib/sensors.hpp
index 2675e7f..9151d59 100644
--- a/redfish-core/lib/sensors.hpp
+++ b/redfish-core/lib/sensors.hpp
@@ -17,6 +17,7 @@
 #include "query.hpp"
 #include "registries/privilege_registry.hpp"
 #include "str_utility.hpp"
+#include "utils/chassis_utils.hpp"
 #include "utils/dbus_utils.hpp"
 #include "utils/json_utils.hpp"
 #include "utils/query_param.hpp"
@@ -413,13 +414,10 @@
                 Callback&& callback)
 {
     BMCWEB_LOG_DEBUG("getChassis enter");
-    constexpr std::array<std::string_view, 2> interfaces = {
-        "xyz.openbmc_project.Inventory.Item.Board",
-        "xyz.openbmc_project.Inventory.Item.Chassis"};
 
     // Get the Chassis Collection
     dbus::utility::getSubTreePaths(
-        "/xyz/openbmc_project/inventory", 0, interfaces,
+        "/xyz/openbmc_project/inventory", 0, chassisInterfaces,
         [callback = std::forward<Callback>(callback), asyncResp,
          chassisIdStr{std::string(chassisId)},
          chassisSubNode{std::string(chassisSubNode)},