[MIPS] Unify dma-{coherent,noncoherent.ip27,ip32}

Platforms will now have to supply a function dma_device_is_coherent which
returns if a particular device participates in the coherence domain.  For
most platforms this function will always return 0 or 1.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index 82b20c2..bf85995 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the PCI specific kernel interface routines under Linux.
 #
 
-obj-y				+= pci.o
+obj-y				+= pci.o pci-dac.o
 
 #
 # PCI bus host bridge specific code