Change modelName to char array in keyword_spotting models' header files

Change-Id: I06c94d0503f762cf0ad2054c1ef087fefbabe69a
diff --git a/applications/baremetal/models/ethos-u55-32/keyword_spotting_cnn_small_int8/model.h b/applications/baremetal/models/ethos-u55-32/keyword_spotting_cnn_small_int8/model.h
index bb3c5de..4fd3be4 100644
--- a/applications/baremetal/models/ethos-u55-32/keyword_spotting_cnn_small_int8/model.h
+++ b/applications/baremetal/models/ethos-u55-32/keyword_spotting_cnn_small_int8/model.h
@@ -27,7 +27,7 @@
 
 const size_t tensorArenaSize = 50000;
 
-const char *modelName = "keyword_spotting_cnn_small_int8";
+static const char modelName[] = "keyword_spotting_cnn_small_int8";
 
 unsigned char networkModelData[] __attribute__((aligned(16), section("network_model_sec"))) = {
     0x1c, 0x00, 0x00, 0x00, 0x54, 0x46, 0x4c, 0x33, 0x00, 0x00, 0x12, 0x00, 0x1c, 0x00, 0x18, 0x00, 0x14, 0x00, 0x10,