dmaengine: stm32-dmamux: use reset controller only at probe time

struct stm32_dmamux_data {

	struct dma_router dmarouter;

	struct clk *clk;

	struct reset_control *rst;

	void __iomem *iomem;

	u32 dma_requests; /* Number of DMA requests connected to DMAMUX */

	u32 dmamux_requests; /* Number of DMA requests routed toward DMAs */

	struct stm32_dmamux_data *stm32_dmamux;

	struct resource *res;

	void __iomem *iomem;

	struct reset_control *rst;

	int i, count, ret;

	u32 dma_req;

		return ret;

	}

	stm32_dmamux->rst = devm_reset_control_get(&pdev->dev, NULL);

	if (!IS_ERR(stm32_dmamux->rst)) {

		reset_control_assert(stm32_dmamux->rst);

	rst = devm_reset_control_get(&pdev->dev, NULL);

	if (!IS_ERR(rst)) {

		reset_control_assert(rst);

		udelay(2);

		reset_control_deassert(stm32_dmamux->rst);

		reset_control_deassert(rst);

	}

	stm32_dmamux->iomem = iomem;