[sensorservice] Modernize codebase by replacing NULL with nullptr

Fixes -Wzero-as-null-pointer-constant warning.

Test: m
Bug: 68236239
Change-Id: I9938306410e9773243b2b9c5e2fc4afdb48b9810
diff --git a/services/sensorservice/SensorRegistrationInfo.h b/services/sensorservice/SensorRegistrationInfo.h
index bba8372..5411515 100644
--- a/services/sensorservice/SensorRegistrationInfo.h
+++ b/services/sensorservice/SensorRegistrationInfo.h
@@ -47,7 +47,7 @@
         mPid = (thread != nullptr) ? thread->getCallingPid() : -1;
         mUid = (thread != nullptr) ? thread->getCallingUid() : -1;
 
-        time_t rawtime = time(NULL);
+        time_t rawtime = time(nullptr);
         struct tm * timeinfo = localtime(&rawtime);
         mHour = static_cast<int8_t>(timeinfo->tm_hour);
         mMin = static_cast<int8_t>(timeinfo->tm_min);