idmap2: fix cpplint warnings

Bug: 189963636
Test: frameworks/base/cmds/idmap2/static-checks.sh
Change-Id: I6da18cdbbd2fc33db711696445230a9f316dc143
diff --git a/cmds/idmap2/CPPLINT.cfg b/cmds/idmap2/CPPLINT.cfg
index 20ed43c..eada694 100644
--- a/cmds/idmap2/CPPLINT.cfg
+++ b/cmds/idmap2/CPPLINT.cfg
@@ -15,4 +15,4 @@
 set noparent
 linelength=100
 root=..
-filter=+build/include_alpha,-runtime/references,-build/c++
+filter=+build/include_alpha,-runtime/references,-build/c++,-build/include_alpha