[POWERPC] boot: export flush_cache

Move the declaration of flush_cache to ops.h for use by platform code.

Signed-off-by: Milton Miller <miltonm@bga.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/main.c

@@ -18,8 +18,6 @@
 #include "gunzip_util.h"
 #include "flatdevtree.h"
 
-extern void flush_cache(void *, unsigned long);
-
 extern char _start[];
 extern char __bss_start[];
 extern char _end[];