HSD #16013024105: fpga: stratix10-soc: stop kernel thread

commit 62549f52ae86890ed6ff8254ec8a1de750c0efd1 from
https://github.com/altera-opensource/linux-socfpga.git

The kernel thread is still running after stratix10-soc gets the running
firmware version. Stop kernel thread after FW version service is completed
to save the kernel resources.

Signed-off-by: Richard Gong <richard.gong@intel.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>