[add] add semaphore testcase src code and Kconfig

examples/utest/testcases/kernel/Kconfig

@@ -5,4 +5,9 @@ config UTEST_MEMHEAP_TC
     default y
     depends on RT_USING_MEMHEAP
 
+config UTEST_SEMAPHORE_TC
+    bool "semaphore test"
+    default n
+    depends on RT_USING_SEMAPHORE
+
 endmenu

examples/utest/testcases/kernel/SConscript

@@ -8,6 +8,9 @@ src     = Split('''
 if GetDepend(['UTEST_MEMHEAP_TC']):
     src += ['memheap_tc.c']
 
+if GetDepend(['UTEST_SEMAPHORE_TC']):
+    src += ['semaphore_tc.c']
+
 CPPPATH = [cwd]
 
 group = DefineGroup('utestcases', src, depend = [], CPPPATH = CPPPATH)