stm32f0: Removed duplicate uart_{enable,disable}_{rx,tx}_dma functions

These are now defined in lib/stm32/common/usart_common_all.c

lib/stm32/f0/usart.c

@@ -29,61 +29,3 @@
  */
 
 #include <libopencm3/stm32/usart.h>
-#include <libopencm3/stm32/rcc.h>
-
-
-/*---------------------------------------------------------------------------*/
-/** @brief USART Receiver DMA Enable.
- *
- * DMA is available on:
- * @li USART1 Rx DMA1 channel 3 or 5.
- * @li USART2 Rx DMA1 channel 5.
- *
- * @param usart USART block register address base @ref usart_reg_base
- */
-
-void usart_enable_rx_dma(uint32_t usart)
-{
-	USART_CR3(usart) |= USART_CR3_DMAR;
-}
-
-/*---------------------------------------------------------------------------*/
-/** @brief USART Receiver DMA Disable.
- *
- * @param usart USART block register address base @ref usart_reg_base
- */
-
-void usart_disable_rx_dma(uint32_t usart)
-{
-	USART_CR3(usart) &= ~USART_CR3_DMAR;
-}
-
-/*---------------------------------------------------------------------------*/
-/** @brief USART Transmitter DMA Enable.
- *
- * DMA is available on:
- * @li USART1 Tx DMA1 channel 2 or 4.
- * @li USART2 Tx DMA1 channel 4.
- *
- * @param usart USART block register address base @ref usart_reg_base
- */
-
-void usart_enable_tx_dma(uint32_t usart)
-{
-	USART_CR3(usart) |= USART_CR3_DMAT;
-}
-
-/*---------------------------------------------------------------------------*/
-/** @brief USART Transmitter DMA Disable.
- *
- * @param usart USART block register address base @ref usart_reg_base
- */
-
-void usart_disable_tx_dma(uint32_t usart)
-{
-	USART_CR3(usart) &= ~USART_CR3_DMAT;
-}
-
-
-/**@}*/
-