selftests: timers: Update .gitignore with newly added tests

Update .gitignore with newly added tests.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
diff --git a/tools/testing/selftests/timers/.gitignore b/tools/testing/selftests/timers/.gitignore
index cc98662..2c8ac84 100644
--- a/tools/testing/selftests/timers/.gitignore
+++ b/tools/testing/selftests/timers/.gitignore
@@ -18,3 +18,5 @@
 valid-adjtimex
 adjtick
 set-tz
+freq-step
+rtctest_setdate