ata: sata_dwc_460ex: select only core part of DMA driver

There is no need to have a platform driver compiled since the DMA driver is
used as a library.

Tested-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 5083f85..0f528d3 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -306,7 +306,7 @@
 config SATA_DWC
 	tristate "DesignWare Cores SATA support"
 	depends on 460EX
-	select DW_DMAC
+	select DW_DMAC_CORE
 	help
 	  This option enables support for the on-chip SATA controller of the
 	  AppliedMicro processor 460EX.