dmaengine: drivers: Kconfig: add HAS_IOMEM dependency to DW_AXI_DMAC

If HAS_IOMEM is not defined and DW_AXI_DMAC is enabled under COMPILE_TEST,
the build fails with the following error:
dw-axi-dmac-platform.c:(.text+0xc4): undefined reference to
`devm_ioremap_resource'
Link: https://www.spinics.net/lists/dmaengine/msg25188.htmlReported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sia Jee Heng <jee.heng.sia@intel.com>
Link: https://lore.kernel.org/r/20210125013255.25799-13-jee.heng.sia@intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/Kconfig

@@ -172,6 +172,7 @@ config DMA_SUN6I
 config DW_AXI_DMAC
 	tristate "Synopsys DesignWare AXI DMA support"
 	depends on OF || COMPILE_TEST
+	depends on HAS_IOMEM
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 	help