Add pin definitions for I2C1 on Cytron IRIV (#2916)

Co-authored-by: Kong Wai Weng <waiweng@cytron.io>

Author: waiweng83

variants/cytron_iriv_io_controller/pins_arduino.h

@@ -64,8 +64,13 @@
 #define PIN_SPI0_SS     (21u)
 
 // Wire
-#define PIN_WIRE0_SDA   (16u)
-#define PIN_WIRE0_SCL   (17u)
+#define __WIRE0_DEVICE i2c0
+#define PIN_WIRE0_SDA  (16u)
+#define PIN_WIRE0_SCL  (17u)
+
+#define __WIRE1_DEVICE i2c1
+#define PIN_WIRE1_SDA  (31u)    // Not used.
+#define PIN_WIRE1_SCL  (31u)    // Not used.