Add Arduino 101 CS pin to examples

examples/CopyFromSD/CopyFromSD.ino

 
 const int SDchipSelect = 4;    // Audio Shield has SD card CS on pin 10
 const int FlashChipSelect = 6; // digital pin for flash chip CS pin
+// Uncomment this line if using the built-in SPI Flash device
+// on an Arduino 101 board
+//const int FlashChipSelect = 21;
 
 void setup() {
   //uncomment these if using Teensy audio shield

examples/CopyFromSerial/CopyFromSerial.ino

 #define MISO              12
 #define SCK               14
 #define CSPIN              6
+// Uncomment this line if using the built-in SPI Flash device
+// on an Arduino 101 board
+//#define CSPIN            21
 
 void setup(){
   Serial.begin(9600);  //Teensy serial is always at full USB speed and buffered... the baud rate here is required but ignored

examples/EraseEverything/EraseEverything.ino

 #include <SPI.h>
 
 const int FlashChipSelect = 6; // digital pin for flash chip CS pin
+// Uncomment this line if using the built-in SPI Flash device
+// on an Arduino 101 board
+//const int FlashChipSelect = 21;
 
 SerialFlashFile file;
 

examples/ListFiles/ListFiles.ino

 #include <SPI.h>
 
 const int FlashChipSelect = 6; // digital pin for flash chip CS pin
+// Uncomment this line if using the built-in SPI Flash device
+// on an Arduino 101 board
+//const int FlashChipSelect = 21;
 
 void setup() {
   //uncomment these if using Teensy audio shield

examples/MP3Player/MP3Player.ino

 
 #define PROP_AMP_ENABLE    5
 #define FLASH_CHIP_SELECT  6
+// Uncomment this line if using the built-in SPI Flash device
+// on an Arduino 101 board
+//#define FLASH_CHIP_SELECT 21
 
 void setup() {
   Serial.begin(9600);

examples/RawHardwareTest/RawHardwareTest.ino

 #include <SPI.h>
 
 const int FlashChipSelect = 6; // digital pin for flash chip CS pin
+// Uncomment this line if using the built-in SPI Flash device
+// on an Arduino 101 board
+//const int FlashChipSelect = 21;
 
 SerialFlashFile file;