dmaengine: dw: fix typo in Kconfig

platfroms -> platforms

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: fed42c198b45 ("dma: dw: add PCI part of the driver")
Cc: Viresh Kumar <vireshk@kernel.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/dw/Kconfig

@@ -24,5 +24,5 @@ config DW_DMAC_PCI
 	select DW_DMAC_CORE
 	help
 	  Support the Synopsys DesignWare AHB DMA controller on the
-	  platfroms that enumerate it as a PCI device. For example,
+	  platforms that enumerate it as a PCI device. For example,
 	  Intel Medfield has integrated this GPDMA controller.