dmaengine: tegra: Fix build error without IOMMU_API

drivers/dma/tegra186-gpc-dma.c: In function ‘tegra_dma_probe’:
drivers/dma/tegra186-gpc-dma.c:1364:24: error: ‘struct iommu_fwspec’ has no member named ‘ids’
  stream_id = iommu_spec->ids[0] & 0xffff;
                        ^~

Make TEGRA186_GPC_DMA depends on IOMMU_API to fix this.

Fixes: ee170280 ("dmaengine: tegra: Add tegra gpcdma driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20220505093236.15076-1-yuehaibing@huawei.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/Kconfig

@@ -632,6 +632,7 @@ config TXX9_DMAC
 config TEGRA186_GPC_DMA
 	tristate "NVIDIA Tegra GPC DMA support"
 	depends on (ARCH_TEGRA || COMPILE_TEST) && ARCH_DMA_ADDR_T_64BIT
+	depends on IOMMU_API
 	select DMA_ENGINE
 	help
 	  Support for the NVIDIA Tegra General Purpose Central DMA controller.