powerpc: Fix GENERIC_ISA_DMA dependency

On PowerPC we should always use generic ISA DMA API implementation as there is simply no other implementation exist.

Without this patch, the following build error pops up:

sound/built-in.o: In function 'snd_dma_pointer':
(.text+0x74ae): undefined reference to 'dma_spin_lock'
...
make: *** [.tmp_vmlinux1] Error 1

This is PPC_85xx, SMP and some sound drivers set to =y.

---
 arch/powerpc/Kconfig |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 328774b..48c8cff 100644
@@ -668,7 +668,7 @@ config NEED_SG_DMA_LENGTH
 
 config GENERIC_ISA_DMA
 	bool
-	depends on PPC64 || POWER4 || 6xx && !CPM2
+	depends on ISA_DMA_API
 	default y
 
 config PPC_INDIRECT_PCI

1.7.0.5

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