configs/rpi: properly fix defconfigs after upstream rebased

configs/rpi: properly fix defconfigs after upstream rebased

Commit 8c3f281626fb (configs/rpi: fix defconfigs after upstream rebased)
attempted to point the raspberrypi defconfigs to an existing commit in
the linux rpi repository.

However, in doing so, only a partial replacement was done: the version
string in the tarball filename was not replaced (missing 'g' to the sed
expression).

Fix that now.

Reported-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>