Proposed fix to #1379. Printrboard I2C LCD support

Marlin/pins.h

   #define MOSI_PIN         10
 #endif
 
+#if defined(ULTRA_LCD) && defined(NEWPANEL)
+  //we have no buzzer installed
+  #define BEEPER -1
+  //LCD Pins
+  #ifdef LCD_I2C_PANELOLU2
+    #define BTN_EN1 27  //RX1 - fastio.h pin mapping 27
+    #define BTN_EN2 26  //TX1 - fastio.h pin mapping 26
+    #define BTN_ENC 43 //A3 - fastio.h pin mapping 43
+    #define SDSS   40 //use SD card on Panelolu2 (Teensyduino pin mapping)
+  #endif //LCD_I2C_PANELOLU2
+  //not connected to a pin
+  #define SDCARDDETECT -1    
+#endif //Ultipanel && Newpanel
+
 #endif // TEENSYLU || PRINTRBOARD
 
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