n64cart: use strscpy in n64cart_probe

n64cart: use strscpy in n64cart_probe

strcpy() has been deprecated [1] because it performs no bounds checking
on the destination buffer, which can lead to buffer overflows. While the
current code works correctly, replace strcpy() with the safer strscpy()
to follow secure coding best practices.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20260517172617.3954-2-thorsten.blum@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>