staging/xgifb: Add header #include guards to vb_table.h

This patch adds a simple #include guard to vb_table.h
Signed-off-by: NPeter Huewe <peterhuewe@gmx.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/xgifb/vb_table.h

+#ifndef _VB_TABLE_
+#define _VB_TABLE_
 /* yilin modify for xgi20 */
 static struct SiS_MCLKData XGI340New_MCLKData[] = {
 	{0x16, 0x01, 0x01, 166},
@@ -2696,3 +2698,4 @@ static struct XGI301C_Tap4TimingStruct YPbPr750pTap4Timing[] = {
 		 }
 	}
 };
+#endif