Add conditional compilation for second I2C interface based on SOC_I2C_NUM (espressif#10408)

The ESP32, ESP32-S and ESP32-H series have two I2C interfaces, while the ESP32-C series has only one.

Author: sivar2311

libraries/Wire/src/Wire.cpp

@@ -646,6 +646,8 @@ void TwoWire::onRequestService(uint8_t num, void *arg) {
 #endif /* SOC_I2C_SUPPORT_SLAVE */
 
 TwoWire Wire = TwoWire(0);
+#if SOC_I2C_NUM > 1
 TwoWire Wire1 = TwoWire(1);
+#endif /* SOC_I2C_NUM */
 
 #endif /* SOC_I2C_SUPPORTED */

libraries/Wire/src/Wire.h

@@ -144,7 +144,9 @@ class TwoWire : public HardwareI2C {
 };
 
 extern TwoWire Wire;
+#if SOC_I2C_NUM > 1
 extern TwoWire Wire1;
+#endif /* SOC_I2C_NUM */
 
 #endif /* SOC_I2C_SUPPORTED */
 #endif /* TwoWire_h */