Support more ADCs

Author: Sh3Rm4n

src/adc.rs

@@ -577,8 +577,11 @@ macro_rules! adc {
     };
 }
 
-#[cfg(feature = "svd-f303")]
-adc!([(1, 1, 2), (2, 1, 2)]);
+adc!([(1, 1, 2)]);
+
+// Is this correct?
+#[cfg(any(feature = "svd-f302", feature = "svd-f303", feature = "svd-f3x4"))]
+adc!([(2, 1, 2)]);
 
 #[cfg(any(feature = "gpio-f303", feature = "gpio-f303e",))]
 adc!([(3, 3, 4), (4, 3, 4)]);