Migrate String8|16.setTo to assignment operator

Bug: 295394788
Test: make checkbuild
Change-Id: Ic98514f48399115046029e68883408090f0cd0db
diff --git a/audio/core/all-versions/default/ParametersUtil.cpp b/audio/core/all-versions/default/ParametersUtil.cpp
index c0e2903..bd4b579 100644
--- a/audio/core/all-versions/default/ParametersUtil.cpp
+++ b/audio/core/all-versions/default/ParametersUtil.cpp
@@ -107,7 +107,7 @@
     String8 paramsAndValues;
     char* halValues = halGetParameters(keys.keysToString().string());
     if (halValues != NULL) {
-        paramsAndValues.setTo(halValues);
+        paramsAndValues = halValues;
         free(halValues);
     } else {
         paramsAndValues.clear();