[add]kernel timer testcase

Author: tyustli

examples/utest/testcases/kernel/Kconfig

@@ -19,4 +19,8 @@ config UTEST_EVENT_TC
     default n
     depends on RT_USING_EVENT
 
+config UTEST_TIMER_TC
+    bool "timer test"
+    default n
+
 endmenu

examples/utest/testcases/kernel/SConscript

@@ -17,6 +17,9 @@ if GetDepend(['UTEST_SEMAPHORE_TC']):
 if GetDepend(['UTEST_EVENT_TC']):
     src += ['event_tc.c']
 
+if GetDepend(['UTEST_TIMER_TC']):
+    src += ['timer_tc.c']
+
 CPPPATH = [cwd]
 
 group = DefineGroup('utestcases', src, depend = [], CPPPATH = CPPPATH)