[POWERPC] Fix dependencies for FSL_DMA

From a powerpc allyesconfig build:

drivers/dma/fsldma.c:504: error: implicit declaration of function 'bus_to_virt'



Signed-off-by: Olof Johansson <olof@lixom.net>

Index: mm/drivers/dma/Kconfig
===================================================================
--- mm.orig/drivers/dma/Kconfig
+++ mm/drivers/dma/Kconfig
@@ -36,7 +36,7 @@ config INTEL_IOP_ADMA
 
 config FSL_DMA
 	bool "Freescale MPC85xx/MPC83xx DMA support"
-	depends on PPC
+	depends on PPC && VIRT_TO_BUS
 	select DMA_ENGINE
 	---help---
 	  Enable support for the Freescale DMA engine. Now, it support
-
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