VIDEO: refactor rgb to not be in the video struct and retain compatability

Author: DacoTaco

gc/ogc/gx_struct.h

@@ -65,7 +65,6 @@ typedef struct _gx_rmodeobj {
 	u16 viWidth;
 	u16 viHeight;
 	u32  xfbMode;
-	u8  rgb;
 	u8  field_rendering;
 	u8  aa;
 	u8  sample_pattern[12][2];