net: account alternate interface name memory

net: account alternate interface name memory

BugLink: https://bugs.launchpad.net/bugs/1969107
[ Upstream commit 5d26cff5bdbebdf98ba48217c078ff102536f134 ]

George reports that altnames can eat up kernel memory.
We should charge that memory appropriately.

Reported-by: George Shuklin <george.shuklin@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 601f748029f35f1e4065a87406dd855142e22c81)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>