Use String8/16 c_str [input]

Bug: 295394788
Test: make checkbuild
Change-Id: Iffbcff6f58e30c0bd40e699ba6e1f917addc5ade
Merged-In: Iffbcff6f58e30c0bd40e699ba6e1f917addc5ade
diff --git a/services/vr/virtual_touchpad/VirtualTouchpadService.cpp b/services/vr/virtual_touchpad/VirtualTouchpadService.cpp
index 523f890..d0a9da1 100644
--- a/services/vr/virtual_touchpad/VirtualTouchpadService.cpp
+++ b/services/vr/virtual_touchpad/VirtualTouchpadService.cpp
@@ -113,7 +113,7 @@
                         static_cast<long>(client_pid_));
     touchpad_->dumpInternal(result);
   }
-  write(fd, result.string(), result.size());
+  write(fd, result.c_str(), result.size());
   return OK;
 }