Staging: xgifb: Fix sparse warnings.

Add include files with function definitions to avoid sparse warnings.
Signed-off-by: Miguel Gómez <magomez@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/xgifb/vb_init.c

@@ -5,6 +5,7 @@
 #include "vb_def.h"
 #include "vb_util.h"
 #include "vb_setmode.h"
+#include "vb_init.h"
 static const unsigned short XGINew_DDRDRAM_TYPE340[4][2] = {
 	{ 16, 0x45},
 	{  8, 0x35},

drivers/staging/xgifb/vb_setmode.c

@@ -4,7 +4,7 @@
 #include "vb_def.h"
 #include "vb_util.h"
 #include "vb_table.h"
-
+#include "vb_setmode.h"
 
 #define  IndexMask 0xff
 #define TVCLKBASE_315_25 (TVCLKBASE_315 + 25)

drivers/staging/xgifb/vb_util.c

 #include "vgatypes.h"
+#include "vb_util.h"
 
 void xgifb_reg_set(unsigned long port, u8 index, u8 data)
 {