pixdesc: Replace a few leftover instances of non AV-prefixed flags

libavutil/pixdesc.c

@@ -1462,7 +1462,8 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
             { 2, 0, 1, 0, 7 },        /* R */
             { 3, 0, 1, 0, 7 },        /* A */
         },
-        .flags = PIX_FMT_PLANAR | PIX_FMT_RGB | PIX_FMT_ALPHA,
+        .flags = AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB |
+                 AV_PIX_FMT_FLAG_ALPHA,
     },
     [AV_PIX_FMT_GBRAP16LE] = {
         .name = "gbrap16le",
@@ -1475,7 +1476,8 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
             { 2, 1, 1, 0, 15 },       /* R */
             { 3, 1, 1, 0, 15 },       /* A */
         },
-        .flags = PIX_FMT_PLANAR | PIX_FMT_RGB | PIX_FMT_ALPHA,
+        .flags = AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB |
+                 AV_PIX_FMT_FLAG_ALPHA,
     },
     [AV_PIX_FMT_GBRAP16BE] = {
         .name = "gbrap16be",
@@ -1488,7 +1490,8 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
             { 2, 1, 1, 0, 15 },       /* R */
             { 3, 1, 1, 0, 15 },       /* A */
         },
-        .flags = PIX_FMT_BE | PIX_FMT_PLANAR | PIX_FMT_RGB | PIX_FMT_ALPHA,
+        .flags = AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR |
+                 AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_ALPHA,
     },
     [AV_PIX_FMT_VDPAU] = {
         .name = "vdpau",