Enable Malyan LCD Support for M200 printers. (#11051)

Marlin/src/config/examples/Malyan/M200/Configuration.h

 // LCD for Malyan M200 printers.
 // This requires SDSUPPORT to be enabled
 //
-//#define MALYAN_LCD
+#define MALYAN_LCD
 
 //
 // CONTROLLER TYPE: Keypad / Add-on