update bsp to lf-5.15.71-2.2.0, rename system image to distro, update downl...

guowenxue

2023-03-30 9c222f3844cd06ce2d59511a01dcbfca8ad8e762

 bsp/images/build.sh

@@ -131,7 +131,9 @@
    pr_warn "clean images files "

    rm -f  *.img *.imx *.bz2 *.gz
    rm -rf boot drivers
    rm -rf drivers
    cd boot
    rm -rf `ls | grep -v .txt`
    exit 0;
}