Fix clang-tidy performance warnings in frameworks/native.

* Use more efficient overloaded string methods.

Bug: 30411878
Test: build with WITH_TIDY=1
Change-Id: Ia0df0e1c830d2cfed2270e62ecb0ad0b51f2e007
diff --git a/services/vr/performanced/task.cpp b/services/vr/performanced/task.cpp
index c2f078e..bda1682 100644
--- a/services/vr/performanced/task.cpp
+++ b/services/vr/performanced/task.cpp
@@ -115,7 +115,7 @@
     std::istream file_stream(&filebuf);
 
     for (std::string line; std::getline(file_stream, line);) {
-      auto offset = line.find(":");
+      auto offset = line.find(':');
       if (offset == std::string::npos) {
         ALOGW("ReadStatusFields: Failed to find delimiter \":\" in line=\"%s\"",
               line.c_str());