staging: xgifb: main: delete redudant extern declarations

Delete redudant declarations and include proper .h files.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/xgifb/XGI_main_26.c b/drivers/staging/xgifb/XGI_main_26.c
index 1350681..a6e9c60 100644
--- a/drivers/staging/xgifb/XGI_main_26.c
+++ b/drivers/staging/xgifb/XGI_main_26.c
@@ -41,7 +41,9 @@
 #include "XGIfb.h"
 #include "vgatypes.h"
 #include "XGI_main.h"
+#include "vb_init.h"
 #include "vb_util.h"
+#include "vb_setmode.h"
 
 #define Index_CR_GPIO_Reg1 0x48
 #define Index_CR_GPIO_Reg2 0x49