md: Add in export.h for files using EXPORT_SYMBOL

These files were getting the defines for EXPORT_SYMBOL because
device.h was including module.h.  But we are going to put an
end to that.  So add the proper export.h include now.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

drivers/md/dm-snap-persistent.c

@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/vmalloc.h>
+#include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/dm-io.h>
 

drivers/md/dm-snap-transient.c

@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/vmalloc.h>
+#include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/dm-io.h>
 

drivers/md/dm-uevent.c

@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/kobject.h>
 #include <linux/dm-ioctl.h>
+#include <linux/export.h>
 
 #include "dm.h"
 #include "dm-uevent.h"

lib/raid6/mktables.c

@@ -60,6 +60,7 @@ int main(int argc, char *argv[])
 	uint8_t exptbl[256], invtbl[256];
 
 	printf("#include <linux/raid/pq.h>\n");
+	printf("#include <linux/export.h>\n");
 
 	/* Compute multiplication table */
 	printf("\nconst u8  __attribute__((aligned(256)))\n"

lib/raid6/recov.c

@@ -18,6 +18,7 @@
  * the syndrome.)
  */
 
+#include <linux/export.h>
 #include <linux/raid/pq.h>
 
 /* Recover two failed data blocks. */