misc: (ds1682) replace obsolete simple_strtoull() with kstrtoull()

simple_strtoull() is obsolete, use the newer kstrtoull() instead.

Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>