powerpc: Export flush_icache_range

Commit aac416fc (lkdtm: flush icache and report actions) calls
flush_icache_range from a module. It's exported on most architectures
that implement it, but not on powerpc. This patch exports it to fix
the module link failure.
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/ppc_ksyms.c

@@ -120,6 +120,7 @@ EXPORT_SYMBOL(giveup_spe);
 EXPORT_SYMBOL(flush_instruction_cache);
 #endif
 EXPORT_SYMBOL(flush_dcache_range);
+EXPORT_SYMBOL(flush_icache_range);
 
 #ifdef CONFIG_SMP
 #ifdef CONFIG_PPC32