[POWERPC] scc_sio: Fix link failure
scc_sio.o should only be built if the txx9 serial driver is actually built into the kernel. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com> -- Signed-off-by: NPaul Mackerras <paulus@samba.org>
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