drivers/input: add export.h to symbol exporting files.

These files are not modules but are exporting symbols and/or
making use of THIS_MODULE macro.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

drivers/input/input-compat.c

@@ -8,6 +8,7 @@
  * the Free Software Foundation.
  */
 
+#include <linux/export.h>
 #include <asm/uaccess.h>
 #include "input-compat.h"
 

drivers/input/input-mt.c

@@ -9,6 +9,7 @@
  */
 
 #include <linux/input/mt.h>
+#include <linux/export.h>
 #include <linux/slab.h>
 
 #define TRKID_SGN	((TRKID_MAX + 1) >> 1)