Ultratronics Pro SPI pins (#19444)

Marlin/src/pins/sam/pins_ULTRATRONICS_PRO.h

 
 /**
  * ReprapWorld ULTRATRONICS v1.0
+ * https://reprapworld.com/documentation/datasheet_ultratronics10_05.pdf
  */
 
 #ifndef ARDUINO_ARCH_SAM
 #define SPI_EEPROM2_CS                        -1
 #define SPI_FLASH_CS                          -1
 
+#define SCK_PIN                               76
+#define MISO_PIN                              74
+#define MOSI_PIN                              75
+
 // SPI for Max6675 or Max31855 Thermocouple
 #define MAX6675_SS_PIN                        65
 #define MAX31855_SS0                          65