mco pkg: WithSystemReserved method fix

[elenagerman]

wrong map keys definition, it was initialized as a variable and replaced with the input values as well. As a result:

"systemReserved": {
                "27Gi": "27Gi",
                "500m": "500m"
            },

instead of

"systemReserved": {
                "memory": "27Gi",
                "cpu": "500m"
            }