Fix rtthread CAN driver issue.
Fix rtthread CAN driver issue.

Reset rx tx handler when closing CAN device, Or it will not work after
reopening.

Change-Id: I43482c21263a989322f8df2ac9349128f7cb630a

gbcwbz/rt-thread,zhaojuntao/rt-thread,armink/rt-thread,AubrCool/rt-thread,geniusgogo/rt-thread,FlyLu/rt-thread,RT-Thread/rt-thread,ArdaFu/rt-thread,AubrCool/rt-thread,hezlog/rt-thread,weiyuliang/rt-thread,FlyLu/rt-thread,RT-Thread/rt-thread,geniusgogo/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,AubrCool/rt-thread,FlyLu/rt-thread,FlyLu/rt-thread,gbcwbz/rt-thread,hezlog/rt-thread,weiyuliang/rt-thread,FlyLu/rt-thread,weety/rt-thread,geniusgogo/rt-thread,armink/rt-thread,geniusgogo/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,gbcwbz/rt-thread,ArdaFu/rt-thread,armink/rt-thread,RT-Thread/rt-thread,zhaojuntao/rt-thread,AubrCool/rt-thread,geniusgogo/rt-thread,weety/rt-thread,AubrCool/rt-thread,ArdaFu/rt-thread,weety/rt-thread,weety/rt-thread,weiyuliang/rt-thread,armink/rt-thread,gbcwbz/rt-thread,FlyLu/rt-thread,FlyLu/rt-thread,RT-Thread/rt-thread,weety/rt-thread,weiyuliang/rt-thread,zhaojuntao/rt-thread,gbcwbz/rt-thread,weiyuliang/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,weiyuliang/rt-thread,zhaojuntao/rt-thread,weety/rt-thread,nongxiaoming/rt-thread,weety/rt-thread,armink/rt-thread,hezlog/rt-thread,ArdaFu/rt-thread,nongxiaoming/rt-thread,hezlog/rt-thread,zhaojuntao/rt-thread,AubrCool/rt-thread,zhaojuntao/rt-thread,AubrCool/rt-thread,armink/rt-thread,gbcwbz/rt-thread,RT-Thread/rt-thread,geniusgogo/rt-thread,weiyuliang/rt-thread,zhaojuntao/rt-thread,hezlog/rt-thread,nongxiaoming/rt-thread,hezlog/rt-thread,ArdaFu/rt-thread,ArdaFu/rt-thread,hezlog/rt-thread,ArdaFu/rt-thread,gbcwbz/rt-thread,nongxiaoming/rt-thread,armink/rt-thread