ice: mention fw_activate action along with devlink reload

ice: mention fw_activate action along with devlink reload

The ice driver reports a helpful status message when updating firmware
indicating what action is necessary to enable the new firmware. This is
done because some updates require power cycling or rebooting the machine
but some can be activated via devlink.

The ice driver only supports activating firmware with the specific action
of "fw_activate" a bare "devlink dev reload" will *not* update the
firmware, and will only perform driver reinitialization.

Update the status message to explicitly reflect that the reload must use
the fw_activate action.

I considered modifying the text to spell out the full command, but felt
that was both overkill and something that would belong better as part of
the user space program and not hard coded into the kernel driver output.

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260430-jk-iwl-net-next-2026-04-30-v1-11-6f27ae1cd073@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>