message: rafs: fix endianness of blob meta flags
  This makes sure blob meta flags are stored as little endianness in
  bootstrap.
diff: @@ -1237,7 +1237,7 @@ impl RafsV6Blob {
  reserved1: 0u32.to_le(),
  compressed_size: blob_info.compressed_size().to_le(),
  uncompressed_size: blob_info.uncompressed_size().to_le(),
  - meta_features: blob_info.meta_flags(),
  + meta_features: blob_info.meta_flags().to_le(),
  ci_compressor: (blob_info.meta_ci_compressor() as u32).to_le(),
  ci_offset: blob_info.meta_ci_offset().to_le(),
  ci_compressed_size: blob_info.meta_ci_compressed_size().to_le(),
  