sparc: Revert generic IOMMU allocator.

I applied the wrong version of this patch series, V4 instead
of V10, due to a patchwork bundling snafu.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc arch/sparc/include/asm/iommu_64.h
Simple merge

diff --cc arch/sparc/kernel/iommu.c
Simple merge

diff --cc arch/sparc/kernel/iommu_common.h
Simple merge

diff --cc arch/sparc/kernel/ldc.c
Simple merge

diff --cc arch/sparc/kernel/pci_sun4v.c
Simple merge

diff --cc include/linux/iommu-common.h
Simple merge

diff --cc lib/Makefile
Simple merge

diff --cc lib/iommu-common.c
Simple merge