video: Add export.h for THIS_MODULE/EXPORT_SYMBOL to drivers/video

With module.h being implicitly everywhere via device.h, the absence
of explicitly including something for EXPORT_SYMBOL went unnoticed.
Since we are heading to fix things up and clean module.h from the
device.h file, we need to explicitly include these files now.

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

drivers/video/omap2/dss/sdi.c

@@ -23,6 +23,7 @@
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/regulator/consumer.h>
+#include <linux/export.h>
 
 #include <video/omapdss.h>
 #include "dss.h"