Explicitly listing affected chips.

Author: richard7770

src/serial.rs

@@ -869,13 +869,18 @@ macro_rules! usart_var_clock {
 }
 
 cfg_if::cfg_if! {
-    if #[cfg(all(
-        any(
-            feature = "mem-4",
-            feature = "mem-6",
-            feature = "mem-8",
-        ),
-        not(feature = "svd-f373")
+    if #[cfg(any(
+        feature = "stm32f301x6",
+        feature = "stm32f301x8",
+        feature = "stm32f318x8",
+        feature = "stm32f302x6",
+        feature = "stm32f302x8",
+        feature = "stm32f303x6",
+        feature = "stm32f303x8",
+        feature = "stm32f328x8",
+        feature = "stm32f334x4",
+        feature = "stm32f334x6",
+        feature = "stm32f334x8",
     ))] {
         // USART1 is accessed through APB2,
         // but USART1SW_A::PCLK will connect its phy to PCLK1.