powerpc/dma: use the generic direct mapping bypass

Now that we've switched all the powerpc nommu and swiotlb methods to
use the generic dma_direct_* calls we can remove these ops vectors
entirely and rely on the common direct mapping bypass that avoids
indirect function calls entirely.  This also allows to remove a whole
lot of boilerplate code related to setting up these operations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/85xx/p1010rdb.c

@@ -55,7 +55,6 @@ static void __init p1010_rdb_setup_arch(void)
 }
 
 machine_arch_initcall(p1010_rdb, mpc85xx_common_publish_devices);
-machine_arch_initcall(p1010_rdb, swiotlb_setup_bus_notifier);
 
 /*
  * Called very early, device-tree isn't unflattened