Staging: epl: fix sparse warning in proc_fs.c

proc_fs.c needs to include proc_fs.h

Cc: Daniel Krueger <daniel.krueger@systec-electronic.com>
Cc: Ronald Sieber <Ronald.Sieber@systec-electronic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/epl/proc_fs.c

@@ -94,6 +94,8 @@
 #include "fec.h"
 #endif
 
+#include "proc_fs.h"
+
 /***************************************************************************/
 /*                                                                         */
 /*                                                                         */