[add][thread]Add api:rt_thread_suspend_force allow suspend other threads.

Author: Rbb666

examples/utest/testcases/kernel/SConscript

@@ -44,6 +44,7 @@ if GetDepend(['UTEST_MAILBOX_TC']):
 if GetDepend(['UTEST_THREAD_TC']):
     src += ['thread_tc.c']
     src += ['thread_overflow_tc.c']
+    src += ['thread_suspend_tc.c']
 
 if GetDepend(['UTEST_DEVICE_TC']):
     src += ['device_tc.c']