IssueID:1807:workaround corrupt when having normal exception when isr.
[Detail] when CONFIG_FREERTOS_INTERRUPT_BACKTRACE opens, XT_DEBUG_BACKTRACE will open. opening XT_DEBUG_BACKTRACE can backtrace interrupt callchain of thread context although it usually useless, but it EXCSAVEx register. if normal exception occurs, which also uses EXCSAVEx register, and having tail interrupt after current isr, it will crush EXCSAVEx, then system will crash. so based on above, close CONFIG_FREERTOS_INTERRUPT_BACKTRACE. [Verified Cases] Build Pass: none Test Pass: none
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