clang-tidy: Enable performance-faster-string-find check

This check optimizes the calls to std::string::find() when the
input passed is a single character string literal. The character
literal overload is more efficient.

Change-Id: I3c95a4214a4e858697c4b40927e0ef990ea86cef
Signed-off-by: Pavithra Barithaya <pavithrabarithaya07@gmail.com>
diff --git a/.clang-tidy b/.clang-tidy
index 5f2970b..3dcd93a 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -214,6 +214,7 @@
 misc-unconventional-assign-operator,
 misc-uniqueptr-reset-release,
 misc-unused-using-decls,
+performance-faster-string-find,
 performance-implicit-conversion-in-loop,
 performance-inefficient-algorithm,
 performance-inefficient-vector-operation,