clang-tidy: Enable modernize-use-emplace check

The check flags insertions to an STL-style container done by
calling the push_back, push, or push_front methods with an
explicitly-constructed temporary of the container element type.
In this case, the corresponding emplace equivalent methods result
in less verbose and potentially more efficient code.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I540c22d3d26195a9d1ead57a4322541951c9ff53
diff --git a/.clang-tidy b/.clang-tidy
index 4642279..92b9cc8 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -218,6 +218,7 @@
 modernize-unary-static-assert,
 modernize-use-bool-literals,
 modernize-use-default-member-init,
+modernize-use-emplace,
 modernize-use-equals-default,
 modernize-use-equals-delete,
 modernize-use-noexcept,