avfilter/vf_lut2: add support for gray10 and gray12 pixel formats

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_lut2.c

@@ -107,7 +107,7 @@ static int query_formats(AVFilterContext *ctx)
         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
         AV_PIX_FMT_GBRP12,
         AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP12,
-        AV_PIX_FMT_GRAY8,
+        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
         AV_PIX_FMT_NONE
     };