add wifi driver fetch in tarball build.sh

guowenxue

2021-12-18 e69555668c6cdb951763008624e6e90a63ddbdd6

 bsp/kernel/build.sh

@@ -98,6 +98,7 @@
    set +x

    if [ $INST_DRIVER != 0 ]  ;then
        rm -rf ${PRJ_PATH}/../rootfs/driver
        make modules_install INSTALL_MOD_PATH=${PRJ_PATH}/../rootfs/driver INSTALL_MOD_STRIP=1
    fi