drivers/dca: Add module.h to dca-core.c

This file really needs the full module.h header file present, but
was just getting it implicitly before.  Call it out in advance so
that we don't get future build failures on this.

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

drivers/dca/dca-core.c

@@ -28,6 +28,7 @@
 #include <linux/device.h>
 #include <linux/dca.h>
 #include <linux/slab.h>
+#include <linux/module.h>
 
 #define DCA_VERSION "1.12.1"