This patch fixes the MGMT add_advertising command repsones with the
wrong opcode when it is trying to return the not supported error.

Fixes: cbbdfa6f ("Bluetooth: Enable controller RPA resolution using Experimental feature")
Signed-off-by: NTedd Ho-Jeong An <tedd.an@intel.com>
Signed-off-by: NLuiz Augusto von Dentz <luiz.von.dentz@intel.com>