dma: let IMX_DMA depend on IMX_HAVE_DMA_V1 instead of an explicit list of SoCs

As a side effect this makes IMX_DMA selectable on i.MX21 again, because
the symbol ARCH_MX21 doesn't exist (MACH_MX21 would have been more correct).
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/dma/Kconfig

@@ -221,7 +221,7 @@ config IMX_SDMA
 
 config IMX_DMA
 	tristate "i.MX DMA support"
-	depends on ARCH_MX1 || ARCH_MX21 || MACH_MX27
+	depends on IMX_HAVE_DMA_V1
 	select DMA_ENGINE
 	help
 	  Support the i.MX DMA engine. This engine is integrated into