utest: ipc: move from examples to components/drivers/ipc

Also:
- Add "RT_" prefix for utest config options.
- Rename the case names to following the naming rule.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

components/drivers/ipc/SConscript

@@ -15,4 +15,9 @@ else:
 
 group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_DEVICE_IPC'], CPPPATH = CPPPATH, LOCAL_CPPDEFINES=['__RT_IPC_SOURCE__'])
 
+list = os.listdir(cwd)
+for item in list:
+    if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
+        group = group + SConscript(os.path.join(item, 'SConscript'))
+
 Return('group')