remove additional V4L2 pixelformat defines

they are upstream since at least linux 2.6.8 (10 Years)
http://lxr.oss.org.cn/ident?v=2.6.8&i=V4L2_PIX_FMT_SBGGR8

modules/videoio/src/cap_v4l.cpp

@@ -272,18 +272,6 @@ struct buffer
 
 static unsigned int n_buffers = 0;
 
-/* Additional V4L2 pixelformats support for Sonix SN9C10x base webcams */
-#ifndef V4L2_PIX_FMT_SBGGR8
-#define V4L2_PIX_FMT_SBGGR8  v4l2_fourcc('B','A','8','1') /* 8 BGBG.. GRGR.. */
-#endif
-#ifndef V4L2_PIX_FMT_SN9C10X
-#define V4L2_PIX_FMT_SN9C10X  v4l2_fourcc('S','9','1','0') /* SN9C10x cmpr. */
-#endif
-
-#ifndef V4L2_PIX_FMT_SGBRG8
-#define V4L2_PIX_FMT_SGBRG8 v4l2_fourcc('G','B','R','G') /* bayer GBRG   GBGB.. RGRG.. */
-#endif
-
 #endif  /* HAVE_CAMV4L2 */
 
 typedef struct CvCaptureCAM_V4L