update iotd hal functions

guowenxue

2021-04-21 e0e3a637e92dbe3c7700cc541410ff19b3b0c80c

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all:
    sed -i -e "s|^CROSSTOOL=.*|CROSSTOOL=${CROSSTOOL}|g" build.sh
    @bash build.sh
 
distclean: 
    @bash build.sh clean