compat: backport dev_level_ratelimited()

compat: backport dev_level_ratelimited()

mcgrof@frijol ~/linux-stable (git::master)$ git describe --contains 6ca04593
v3.5-rc1~147^2~7

This is only enabled for kernels where ratelimit.h was added.

commit 6ca045930338485a8cdef117e74372aa1678009d
Author: Hiroshi DOYU <hdoyu@nvidia.com>
Date:   Mon May 14 10:47:57 2012 +0300

    driver core: Add dev_*_ratelimited() family

    Add dev_*_ratelimited() family, dev_* version of pr_*_ratelimited().

    Using Joe Perches's proposal/implementation.

    Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
    Cc: Joe Perches <joe@perches.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>