aoe: replace strncpy with strscpy

`strncpy` is deprecated for use on NUL-terminated destination strings [1].

`aoe_iflist` is expected to be NUL-terminated which is evident by its
use with string apis later on like `strspn`:
| 	p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);

It also seems `aoe_iflist` does not need to be NUL-padded which means
`strscpy` [2] is a suitable replacement due to the fact that it
guarantees NUL-termination on the destination buffer while not
unnecessarily NUL-padding.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: [email protected]
Cc: Kees Cook <[email protected]>
Cc: Xu Panda <[email protected]>
Cc: Yang Yang <[email protected]>
Signed-off-by: Justin Stitt <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/20230919-strncpy-drivers-block-aoe-aoenet-c-v2-1-3d5d158410e9@google.com
Signed-off-by: Jens Axboe <[email protected]>

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