Merge pull request #4102 from wdwalker/lpc-pindefs

Add SCL and SDA defs for I2C[0-2]; redefine I2C_[SCL,SDA] to I2C2

Author: sg-

targets/TARGET_NXP/TARGET_LPC176X/TARGET_MBED_LPC1768/PinNames.h

@@ -106,11 +106,17 @@ typedef enum {
     A4 = P1_30,
     A5 = P1_31,
 
-    I2C_SCL = D15,
-    I2C_SDA = D14,
-
     // Not connected
-    NC = (int)0xFFFFFFFF
+    NC = (int)0xFFFFFFFF,
+
+    I2C_SCL0 = NC,
+    I2C_SDA0 = NC,
+    I2C_SCL1 = p10,
+    I2C_SDA1 = p9,
+    I2C_SCL2 = p27, // pin used by application board
+    I2C_SDA2 = p28, // pin used by application board
+    I2C_SCL = I2C_SCL2,
+    I2C_SDA = I2C_SDA2,
 } PinName;
 
 typedef enum {