libpayload, superiotool: README: Prepend `coreboot/` to path of change directory line

Nico Huber spotted [1], that commit (4d6ab4e2) [1] updating
superiotools’s `README` with the Git command line

    superiotool: Update README with Git repository URL and directory location

missed, that after `git clone` one sitll has to change into
the cloned directory.

So prepend the path with `coreboot/` to fix that. The same error
happened in the commit (e1ea5151) for libpayload [2]

    libpayload: Update README with Git repository URL and directory location

and is fixed in this patch too.

[1] http://review.coreboot.org/#/c/3019/
[2] http://review.coreboot.org/2228

Change-Id: Ib6e8b678af6276556a40ccfd52ae35ca7e674455
Reported-by: Nico Huber <nico.h@gmx.de>
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/3021
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.huber@secunet.com>
2 files changed