drivers/w1: Add export.h for EXPORT_SYMBOL/THIS_MODULE

Give these files export.h so that they can reliably get the EXPORT_SYMBOL
and THIS_MODULE macros in the future, once module.h isn't implicitly
everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index d220bce..aa3971c 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -24,6 +24,7 @@
 #include <linux/delay.h>
 #include <linux/kthread.h>
 #include <linux/slab.h>
+#include <linux/export.h>
 
 #include "w1.h"
 #include "w1_log.h"