sh: Don't export flush_dcache_all().

flush_dcache_all() is used internally by the SH-4 cache code, it is not
part of the exported cache API, so make it static and don't export it.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index 4ac844b..4466787 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -182,7 +182,7 @@
 	local_irq_restore(flags);
 }
 
-void flush_dcache_all(void)
+static inline void flush_dcache_all(void)
 {
 	(*__flush_dcache_segment_fn)(0UL, boot_cpu_data.dcache.way_size);
 	wmb();