libcpu/nuclei: Fix wrong RT_KERNEL_INTERRUPT_LEVEL
libcpu/nuclei: Fix wrong RT_KERNEL_INTERRUPT_LEVEL

RT_KERNEL_INTERRUPT_LEVEL set to 0 is the lowest level.

Signed-off-by: Huaqi Fang <340cc3cd9ffd795ec7885734e62ff7093943c58b@qq.com>

weety/rt-thread,weety/rt-thread,hezlog/rt-thread,RT-Thread/rt-thread,hezlog/rt-thread,ArdaFu/rt-thread,armink/rt-thread,weety/rt-thread,ArdaFu/rt-thread,armink/rt-thread,hezlog/rt-thread,hezlog/rt-thread,ArdaFu/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,RT-Thread/rt-thread,weety/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,geniusgogo/rt-thread,armink/rt-thread,geniusgogo/rt-thread,armink/rt-thread,ArdaFu/rt-thread,armink/rt-thread,weety/rt-thread,nongxiaoming/rt-thread,ArdaFu/rt-thread,hezlog/rt-thread,nongxiaoming/rt-thread,armink/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,ArdaFu/rt-thread,weety/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,nongxiaoming/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,ArdaFu/rt-thread,weety/rt-thread,hezlog/rt-thread,nongxiaoming/rt-thread,RT-Thread/rt-thread,geniusgogo/rt-thread,RT-Thread/rt-thread,armink/rt-thread,geniusgogo/rt-thread