Explain the elf/cpio.gz snippet of code, and update a comment to
reflect the correct variable name. No functional change.
(From OE-Core rev: 0ca4a3a25e4495bf6e2e3932c019bd15856faf55)
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>