USB: serial: ti_usb_3410_5052: use strscpy() instead of strcpy()

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
Signed-off-by: Johan Hovold <johan@kernel.org>