Metadata Populator: use char[] instead of absl::string_view for metadata buffer name constant.

PiperOrigin-RevId: 370854340

Author: tensorflower-gardener

tensorflow_lite_support/metadata/cc/metadata_populator.cc

@@ -33,7 +33,7 @@ namespace tflite {
 namespace metadata {
 
 namespace {
-constexpr absl::string_view kMetadataBufferName = "TFLITE_METADATA";
+constexpr char kMetadataBufferName[] = "TFLITE_METADATA";
 
 using ::absl::StatusCode;
 using ::tflite::support::CreateStatusWithPayload;