aio: Fix setting adc bits when initializing

Set the adc bits to the default value of 10,
so the raw bits of the platform will not take
effect during initialization, and it is always the default value

Signed-off-by: chao zeng <[email protected]>

Author: AsuraZeng

src/aio/aio.c

@@ -133,7 +133,7 @@ mraa_aio_init(unsigned int aio)
     }
 
     raw_bits = mraa_adc_raw_bits();
-    mraa_aio_set_bit(dev, DEFAULT_BITS);
+    mraa_aio_set_bit(dev, raw_bits);
 
     if (IS_FUNC_DEFINED(dev, aio_init_pre)) {
         mraa_result_t pre_ret = (dev->advance_func->aio_init_pre(aio));