add yocto rootfs support in rootfs build shell script

guowenxue

2021-11-16 f073905c67250f13f550432a79ccc5dcc834a8c1

 bsp/rootfs/build.sh

@@ -133,8 +133,8 @@
    cd ${PRJ_PATH}
}

if [ $ROOTFS == buildroot ]  ;then
    echo "INFO: buildroot no need build."
if [ $ROOTFS == buildroot -o $ROOTFS == yocto ]  ;then
    echo "INFO: $ROOTFS no need build."
    exit 0;
fi