ia64: export flush_icache_range for module use

This is needed the following modules:

"Linux Kernel Dump Test Tool Module"
CONFIG_LKDTM		drivers/misc/lkdtm.c

Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/ia64_ksyms.c

@@ -96,3 +96,6 @@ EXPORT_SYMBOL(ia64_ivt);
 /* mcount is defined in assembly */
 EXPORT_SYMBOL(_mcount);
 #endif
+
+#include <asm/cacheflush.h>
+EXPORT_SYMBOL_GPL(flush_icache_range);