utest: UTEST_SERIAL_BYPASS -> RT_UTEST_SERIAL_BYPASS

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

components/drivers/serial/utest/Kconfig

@@ -1,6 +1,6 @@
 menu "Serial Unit Testcases"
 
-    config UTEST_SERIAL_BYPASS
+    config RT_UTEST_SERIAL_BYPASS
         bool "Serial Bypass testcases"
         default n
         depends on RT_USING_SERIAL_BYPASS

components/drivers/serial/utest/bypass/SConscript

@@ -6,6 +6,6 @@ src     = Glob('bypass*.c')
 
 CPPPATH = [cwd]
 
-group = DefineGroup('utestcases', src, depend = ['UTEST_SERIAL_BYPASS'], CPPPATH = CPPPATH)
+group = DefineGroup('utestcases', src, depend = ['RT_UTEST_SERIAL_BYPASS'], CPPPATH = CPPPATH)
 
 Return('group')