ice: Fix KASAN error in LAG NETDEV_UNREGISTER handler

In the Linux kernel, the following vulnerability has been resolved:

ice: Fix KASAN error in LAG NETDEV_UNREGISTER handler

Currently, the same handler is called for both a NETDEV_BONDING_INFO

LAG unlink notification as for a NETDEV_UNREGISTER call. This is

causing a problem though, since the netdev_notifier_info passed has

a different structure depending on which event is passed. The problem

manifests as a call trace from a BUG: KASAN stack-out-of-bounds error.

Fix this by creating a handler specific to NETDEV_UNREGISTER that only

is passed valid elements in the netdev_notifier_info struct for the

NETDEV_UNREGISTER event.

Also included is the removal of an unbalanced dev_put on the peer_netdev

and related braces.