Remove Set from engine config API

Signed-off-by: Evan Lezar <elezar@nvidia.com>

pkg/config/engine/docker/docker.go

@@ -105,7 +105,7 @@ func (c Config) DefaultRuntime() string {
 
 // EnableCDI sets features.cdi to true in the docker config.
 func (c *Config) EnableCDI() {
-	c.Set("features", map[string]bool{"cdi": true})
+	(*c)["features"] = map[string]bool{"cdi": true}
 }
 
 // RemoveRuntime removes a runtime from the docker config
@@ -137,11 +137,6 @@ func (c *Config) RemoveRuntime(name string) error {
 	return nil
 }
 
-// Set sets the specified docker option
-func (c *Config) Set(key string, value interface{}) {
-	(*c)[key] = value
-}
-
 // Save writes the config to the specified path
 func (c Config) Save(path string) (int64, error) {
 	output, err := json.MarshalIndent(c, "", "    ")