Remove this API, consolidate into setup_dma_transfer

[kammce]

libhal-__arm_mcu_family__/include/libhal-__arm_mcu_family__/dma.hpp

Lines 84 to 91 in 7154022

	/**
	* @brief Initialize DMA controller
	*
	* On first call, enables DMA. Once enabled, additional calls to this function
	* do nothing.
	*
	*/
	void initialize_dma();