added cloning of the linux-elphel repository and copying over linux

# Kernel version and SRCREV correspond to: 

# github.com/Xilinx/linux-xlnx.git xilinx-v14.7 tag 

SRCREV = "efc27505715e64526653f35274717c0fc56491e3"

linux-elphel_label= "git://git.code.sf.net/p/elphel/linux-elphel"

linux-elphel_branch= "master"

linux-elphel_gitdir= "${WORKDIR}/linux-elphel"

do_fetch_append() {

    print("Cloninig ${linux-elphel_label}\n")

    os.system("git clone -b ${linux-elphel_branch} ${linux-elphel_label} ${linux-elphel_gitdir}")

}

do_unpack_append() {

    print("Copying ${linux-elphel_gitdir} over ${S}\n")

    os.system("cp -rf ${linux-elphel_gitdir}/* ${S}")

}

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