devlink: Add a new time-stamp format for health reporter's dump

devlink: Add a new time-stamp format for health reporter's dump

Introduce a new attribute representing a new time-stamp format: current
time in ns (to comply with y2038) instead of jiffies. If the new
attribute was received, translate the time-stamp accordingly (ns).

Fixes: 2f1242efe9d0 ("devlink: Add devlink health show command")
Signed-off-by: Aya Levin <ayal@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>