powerpc: allow NOT_COHERENT_CACHE for amigaone

AMIGAONE selects NOT_COHERENT_CACHE, so we better allow it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/Kconfig.cputype

@@ -400,7 +400,8 @@ config NR_CPUS
 
 config NOT_COHERENT_CACHE
 	bool
-	depends on 4xx || PPC_8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON
+	depends on 4xx || PPC_8xx || E200 || PPC_MPC512x || \
+		GAMECUBE_COMMON || AMIGAONE
 	default n if PPC_47x
 	default y