host-bmc: motherboard: Delete move methods

```
In file included from ../host-bmc/host_pdr_handler.cpp:7:
In file included from ../host-bmc/dbus/custom_dbus.hpp:6:
../host-bmc/dbus/motherboard.hpp:29:5: error: explicitly defaulted move constructor is implicitly deleted [-Werror,-Wdefaulted-function-deleted]
   29 |     Motherboard(Motherboard&&) = default;
      |     ^
../host-bmc/dbus/motherboard.hpp:22:21: note: move constructor of 'Motherboard' is implicitly deleted because base class 'ItemMotherboard' (aka 'object<sdbusplus::server::xyz::openbmc_project::inventory::item::board::Motherboard>') has a deleted move constructor
   22 | class Motherboard : public ItemMotherboard
      |                     ^
../subprojects/sdbusplus/include/sdbusplus/server/object.hpp:54:5: note: 'object' has been explicitly marked deleted here
   54 |     object(object&&) = delete;
      |     ^
../host-bmc/dbus/motherboard.hpp:29:34: note: replace 'default' with 'delete'
   29 |     Motherboard(Motherboard&&) = default;
      |                                  ^~~~~~~
      |                                  delete
../host-bmc/dbus/motherboard.hpp:30:18: error: explicitly defaulted move assignment operator is implicitly deleted [-Werror,-Wdefaulted-function-deleted]
   30 |     Motherboard& operator=(Motherboard&&) = default;
      |                  ^
../host-bmc/dbus/motherboard.hpp:22:21: note: move assignment operator of 'Motherboard' is implicitly deleted because base class 'ItemMotherboard' (aka 'object<sdbusplus::server::xyz::openbmc_project::inventory::item::board::Motherboard>') has a deleted move assignment operator
   22 | class Motherboard : public ItemMotherboard
      |                     ^
../subprojects/sdbusplus/include/sdbusplus/server/object.hpp:55:13: note: 'operator=' has been explicitly marked deleted here
   55 |     object& operator=(object&&) = delete;
      |             ^
../host-bmc/dbus/motherboard.hpp:30:45: note: replace 'default' with 'delete'
   30 |     Motherboard& operator=(Motherboard&&) = default;
      |                                             ^~~~~~~
      |                                             delete
```

Change-Id: If739f3d044c559f56dab143d5c53800a9d6f5082
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/host-bmc/dbus/motherboard.hpp b/host-bmc/dbus/motherboard.hpp
index abf061c..bf62036 100644
--- a/host-bmc/dbus/motherboard.hpp
+++ b/host-bmc/dbus/motherboard.hpp
@@ -26,8 +26,8 @@
     ~Motherboard() = default;
     Motherboard(const Motherboard&) = delete;
     Motherboard& operator=(const Motherboard&) = delete;
-    Motherboard(Motherboard&&) = default;
-    Motherboard& operator=(Motherboard&&) = default;
+    Motherboard(Motherboard&&) = delete;
+    Motherboard& operator=(Motherboard&&) = delete;
 
     Motherboard(sdbusplus::bus_t& bus, const std::string& objPath) :
         ItemMotherboard(bus, objPath.c_str())