Merge pull request #464 from AubrCool/fix-stm32.pin64.define.err

correct stm32f10x pin64 define error

bsp/stm32f10x/drivers/gpio.c

@@ -35,6 +35,7 @@ struct pin_index
 static const struct pin_index pins[] =
 {
 #if (STM32F10X_PIN_NUMBERS == 64)
+    __STM32_PIN_DEFAULT,
     __STM32_PIN_DEFAULT,
     __STM32_PIN(2, APB2, C, 13),
     __STM32_PIN(3, APB2, C, 14),