Add conditional, give DUE SPI a unique name, fix compiler warnings (#10168)

Marlin/src/HAL/HAL_DUE/HAL_spi_Due.cpp

 // Public functions
 // --------------------------------------------------------------------------
 
-#if ENABLED(SOFTWARE_SPI)
+#if ENABLED(DUE_SOFTWARE_SPI)
 
   // --------------------------------------------------------------------------
   // software SPI

Marlin/src/HAL/HAL_DUE/spi_pins.h

   #define MOSI_PIN          75
 #else
   // defaults
-  #define SOFTWARE_SPI
+  #define DUE_SOFTWARE_SPI
   #define SCK_PIN           52
   #define MISO_PIN          50
   #define MOSI_PIN          51

Marlin/src/lcd/ultralcd_impl_DOGM.h

     U8GLIB_LM6059_2X u8g(DOGLCD_CS, DOGLCD_A0); // 4 stripes
 
 #elif ENABLED(U8GLIB_ST7565_64128N)
-  // The MaKrPanel, Mini Viki, and Viki 2.0, ST7565 controller
-  #if DOGLCD_SCK == SCK_PIN && DOGLCD_MOSI == MOSI_PIN
+  // The MaKrPanel, Mini Viki, Viki 2.0 & AZSMZ 12864 ST7565 controller
+  #define SMART_RAMPS (MB(RAMPS_SMART_EFB) || MB(RAMPS_SMART_EEB) || MB(RAMPS_SMART_EFF) || MB(RAMPS_SMART_EEF) || MB(RAMPS_SMART_SF))
+  #if DOGLCD_SCK == SCK_PIN && DOGLCD_MOSI == MOSI_PIN && !SMART_RAMPS
     U8GLIB_64128N_2X_HAL u8g(DOGLCD_CS, DOGLCD_A0);  // using HW-SPI
   #else
     U8GLIB_64128N_2X_HAL u8g(DOGLCD_SCK, DOGLCD_MOSI, DOGLCD_CS, DOGLCD_A0);  // using SW-SPI

Marlin/src/pins/pins_RAMPS.h

 
       #define ADC_KEYPAD_PIN    12
 
+    #elif ENABLED(AZSMZ_12864)
+
+      // Pins only defined for RAMPS_SMART currently
+
     #else
 
       // Beeper on AUX-4

Marlin/src/pins/pins_RAMPS_SMART.h

 //
 // Support for AZSMZ 12864 LCD with SD Card 3D printer smart controller control panel
 #if ENABLED(AZSMZ_12864)
-  #define BEEPER_PIN       66
+  #define BEEPER_PIN       66 // Smart RAMPS 1.42 pinout diagram on RepRap WIKI erroneously says this should be pin 65
   #define DOGLCD_A0        59
   #define DOGLCD_CS        44
   #define BTN_EN1          58
   #define BTN_EN2          40
-  #define BTN_ENC          67
+  #define BTN_ENC          67 // Smart RAMPS 1.42 pinout diagram on RepRap WIKI erroneously says this should be pin 66
   #define SD_DETECT_PIN    49 // Pin 49 for display sd interface, 72 for easy adapter board
   #define KILL_PIN         42
 #endif