Use String8/16 c_str [sensors]

Bug: 295394788
Test: make checkbuild
Change-Id: I09c5127f66c0ba1f7eef8951e3ab15f50f822d22
Merged-In: I09c5127f66c0ba1f7eef8951e3ab15f50f822d22
diff --git a/services/sensorservice/SensorDevice.cpp b/services/sensorservice/SensorDevice.cpp
index de050e0..184fa76 100644
--- a/services/sensorservice/SensorDevice.cpp
+++ b/services/sensorservice/SensorDevice.cpp
@@ -299,7 +299,7 @@
         result.appendFormat("}, selected = %.2f ms\n", info.bestBatchParams.mTBatch / 1e6f);
     }
 
-    return result.string();
+    return result.c_str();
 }
 
 /**