src: Current code produces warnings for possible value overflows. (#6665)

As the input values are uint8_t types, any shift may result in value loss.
Explicit promotion to the output type (uint32_t) keeps things safe.
Have also changed the int32_t in ads1220_read_adc to uint32_t, type
promotion and bit manipulation are a bit 'weird' on signed integers, so
keep it as an unsigned to align with following function call parameter type.
Have retained the prior explicit sign extension logic however.

Signed-off-by: Bevan Weiss <bevan.weiss@gmail.com>

src/sensor_hx71x.c

@@ -27,8 +27,8 @@ struct hx71x_adc {
 };
 
 #define BYTES_PER_SAMPLE 4
-#define SAMPLE_ERROR_DESYNC 1 << 31
-#define SAMPLE_ERROR_READ_TOO_LONG 1 << 30
+#define SAMPLE_ERROR_DESYNC 1L << 31
+#define SAMPLE_ERROR_READ_TOO_LONG 1L << 30
 
 static struct task_wake wake_hx71x;