dmaengine: mmp_tdma: fix the arch dependency

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

drivers/dma/Kconfig

@@ -276,7 +276,7 @@ config DMA_SA11X0
 
 config MMP_TDMA
 	bool "MMP Two-Channel DMA support"
-	default ARCH_MMP
+	depends on ARCH_MMP
 	select DMA_ENGINE
 	help
 	  Support the MMP Two-Channel DMA engine.