[POWERPC] Export copy_4K_page()

Export copy_4K_page() for use by modules via copy_page() (such as
CacheFiles).
Signed-Off-By: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/ppc_ksyms.c

@@ -91,6 +91,9 @@ EXPORT_SYMBOL(__copy_tofrom_user);
 EXPORT_SYMBOL(__clear_user);
 EXPORT_SYMBOL(__strncpy_from_user);
 EXPORT_SYMBOL(__strnlen_user);
+#ifdef CONFIG_PPC64
+EXPORT_SYMBOL(copy_4K_page);
+#endif
 
 #ifndef  __powerpc64__
 EXPORT_SYMBOL(__ide_mm_insl);