[LL][USART] Fix compilation warnings generated with ARMV6 compiler

Inc/stm32f3xx_ll_usart.h

diff --git a/Inc/stm32f3xx_ll_usart.h b/Inc/stm32f3xx_ll_usart.h
index 5d9169f..c35fdef 100644
--- a/Inc/stm32f3xx_ll_usart.h
+++ b/Inc/stm32f3xx_ll_usart.h
@@ -1769,7 +1769,7 @@
   */
 __STATIC_INLINE void LL_USART_SetIrdaPrescaler(USART_TypeDef *USARTx, uint32_t PrescalerValue)
 {
-  MODIFY_REG(USARTx->GTPR, (uint16_t)USART_GTPR_PSC, (uint16_t)PrescalerValue);
+  MODIFY_REG(USARTx->GTPR, USART_GTPR_PSC, (uint16_t)PrescalerValue);
 }
 
 /**
@@ -1916,7 +1916,7 @@
   */
 __STATIC_INLINE void LL_USART_SetSmartcardPrescaler(USART_TypeDef *USARTx, uint32_t PrescalerValue)
 {
-  MODIFY_REG(USARTx->GTPR, (uint16_t)USART_GTPR_PSC, (uint16_t)PrescalerValue);
+  MODIFY_REG(USARTx->GTPR, USART_GTPR_PSC, (uint16_t)PrescalerValue);
 }
 
 /**
@@ -1945,7 +1945,7 @@
   */
 __STATIC_INLINE void LL_USART_SetSmartcardGuardTime(USART_TypeDef *USARTx, uint32_t GuardTime)
 {
-  MODIFY_REG(USARTx->GTPR, (uint16_t)USART_GTPR_GT, (uint16_t)(GuardTime << USART_GTPR_GT_Pos));
+  MODIFY_REG(USARTx->GTPR, USART_GTPR_GT, (uint16_t)(GuardTime << USART_GTPR_GT_Pos));
 }
 
 /**