fix clock for usart4/5

sprhawk · sprhawk · commit dcd45f89d9bf · 2020-09-02T00:16:08.000+08:00
diff --git a/src/serial.rs b/src/serial.rs
@@ -477,6 +477,6 @@ hal! {
     feature = "stm32f398"
 ))]
 hal! {
-    USART4: (usart4, APB1, usart4en, usart4rst, pclk2),
-    USART5: (usart5, APB1, usart5en, usart5rst, pclk2),
+    USART4: (usart4, APB1, usart4en, usart4rst, pclk1),
+    USART5: (usart5, APB1, usart5en, usart5rst, pclk1),
 }

Original file line number	Diff line number	Diff line change
`@@ -477,6 +477,6 @@ hal! {`
`477`	`477`	`feature = "stm32f398"`
`478`	`478`	`))]`
`479`	`479`	`hal! {`
`480`		`- USART4: (usart4, APB1, usart4en, usart4rst, pclk2),`
`481`		`- USART5: (usart5, APB1, usart5en, usart5rst, pclk2),`
	`480`	`+ USART4: (usart4, APB1, usart4en, usart4rst, pclk1),`
	`481`	`+ USART5: (usart5, APB1, usart5en, usart5rst, pclk1),`
`482`	`482`	`}`