[drv_usart.c]修复stm32串口开启奇偶校验时字长设置错误
[drv_usart.c]修复stm32串口开启奇偶校验时字长设置错误

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