powerpc/pci: Move IO workarounds to the common kernel dir

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 54db9fb..f2352fc 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -163,6 +163,9 @@
 	bool
 	select PPC_INDIRECT_IO
 
+config PPC_IO_WORKAROUNDS
+	bool
+
 config GENERIC_IOMAP
 	bool