clang-tidy: Enable readability-simplify-boolean-expr check

This checks for boolean expressions involving boolean constants
and simplifies them to use the appropriate boolean expression
directly.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: If2316dc52cbd280971f0333ee805b11e1b99d27f
diff --git a/.clang-tidy b/.clang-tidy
index 17375d0..7a042f3 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -273,6 +273,7 @@
 readability-redundant-preprocessor,
 readability-redundant-smartptr-get,
 readability-redundant-string-init,
+readability-simplify-boolean-expr,
 readability-simplify-subscript-expr,
 readability-static-accessed-through-instance,
 readability-static-definition-in-anonymous-namespace,