Use String8/16 c_str [idmap2, androidfw]

Bug: 295394788
Test: make checkbuild
Change-Id: I95264e8bfc96a5adb7f7cc55a24dc0e8c126371d
diff --git a/libs/androidfw/tests/ResTable_test.cpp b/libs/androidfw/tests/ResTable_test.cpp
index 945981b..faac514 100644
--- a/libs/androidfw/tests/ResTable_test.cpp
+++ b/libs/androidfw/tests/ResTable_test.cpp
@@ -468,7 +468,7 @@
   String16 name(u"com.android.sparse:integer/foo_9");
   uint32_t flags;
   uint32_t resid =
-      table.identifierForName(name.string(), name.size(), nullptr, 0, nullptr, 0, &flags);
+      table.identifierForName(name.c_str(), name.size(), nullptr, 0, nullptr, 0, &flags);
   ASSERT_NE(0u, resid);
 
   Res_value val;