Migrate String8|16.setTo to assignment operator [sensors]

Bug: 295394788
Test: make checkbuild
Change-Id: I63b97b573f6b182ba36c4eb933b695d7a6ed59d0
(cherry picked from commit d89f609d2cbdba779372de6e80e849d7cb33e99d)
diff --git a/libs/sensor/Sensor.cpp b/libs/sensor/Sensor.cpp
index 9127b37..a1549ea 100644
--- a/libs/sensor/Sensor.cpp
+++ b/libs/sensor/Sensor.cpp
@@ -627,7 +627,7 @@
     if (size < len) {
         return false;
     }
-    outputString8.setTo(static_cast<char const*>(buffer), len);
+    outputString8 = String8(static_cast<char const*>(buffer), len);
 
     if (size < FlattenableUtils::align<4>(len)) {
         ALOGE("Malformed Sensor String8 field. Should be in a 4-byte aligned buffer but is not.");