Added explanation of --system-id option to the output of
wic help kickstart.
[YOCTO #9096]
(From OE-Core rev: 1a304afea4ad7be12ed5f0fcb397a538345a6b63)
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>