dmaengine: dw: don't prompt for DW_DMAC_CORE

DW_DMAC_CORE is slected by PCI or Platform driver, so this symbol shouldn't
be user selectable, so remove the prompt
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/dw/Kconfig

@@ -3,7 +3,7 @@
 #
 
 config DW_DMAC_CORE
-	tristate "Synopsys DesignWare AHB DMA support"
+	tristate
 	select DMA_ENGINE
 
 config DW_DMAC