MIPS: ls1bdev: default instruction set MIPSr2
MIPS: ls1bdev: default instruction set MIPSr2

-mips32 will break the compilation if FPU enabled.

Signed-off-by: duhuanpeng <28718a564f314b74120dd8eea67d7e1cc1adee23@qq.com>

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