Create and use pins_MELZI_MALYAN.h for Malyan M150

Marlin/src/config/examples/Malyan/M150/Configuration.h

 // The following define selects which electronics board you have.
 // Please choose the name from boards.h that matches your setup
 #ifndef MOTHERBOARD
-  #define MOTHERBOARD BOARD_MELZI
+  #define MOTHERBOARD BOARD_MELZI_MALYAN
 #endif
 
 // Optional custom name for your RepStrap or other custom machine

Marlin/src/core/boards.h

 #define BOARD_MELZI             63    // Melzi
 #define BOARD_MELZI_MAKR3D      66    // Melzi with ATmega1284 (MaKr3d version)
 #define BOARD_MELZI_CREALITY    89    // Melzi Creality3D board (for CR-10 etc)
+#define BOARD_MELZI_MALYAN      92    // Melzi Malyan M150 board
 #define BOARD_STB_11            64    // STB V1.1
 #define BOARD_AZTEEG_X1         65    // Azteeg X1
 

Marlin/src/pins/pins.h

   #include "pins_MELZI_MAKR3D.h"      // ATmega644P, ATmega1284P
 #elif MB(MELZI_CREALITY)
   #include "pins_MELZI_CREALITY.h"    // ATmega644P, ATmega1284P
+#elif MB(MELZI_MALYAN)
+  #include "pins_MELZI_MALYAN.h"      // ATmega644P, ATmega1284P
 #elif MB(STB_11)
   #include "pins_STB_11.h"            // ATmega644P, ATmega1284P
 #elif MB(AZTEEG_X1)

Marlin/src/pins/pins_MELZI_MALYAN.h

+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Melzi (Malyan M150) pin assignments
+ */
+
+#define BOARD_NAME "Melzi (Malyan)"
+#define IS_MELZI
+
+#include "pins_SANGUINOLOLU_12.h"
+
+#undef LCD_SDSS
+#undef LCD_PINS_RS
+#undef LCD_PINS_ENABLE
+#undef LCD_PINS_D4
+#undef BTN_EN1
+#undef BTN_EN2
+#undef BTN_ENC
+
+#define LCD_PINS_RS     17 // st9720 CS
+#define LCD_PINS_ENABLE 16 // st9720 DAT
+#define LCD_PINS_D4     11 // st9720 CLK
+#define BTN_EN1         30
+#define BTN_EN2         29
+#define BTN_ENC         28
+
+// Alter timing for graphical display
+#define ST7920_DELAY_1 DELAY_2_NOP
+#define ST7920_DELAY_2 DELAY_2_NOP
+#define ST7920_DELAY_3 DELAY_2_NOP