`*memory` is not changed in `hexdump()` and just read so make it
`const`.
Change-Id: I9504d25ab5c785f05c39c9a4f48c21f68659a829
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/5403
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)