ALSA: n64: Replace deprecated strcpy() with strscpy()

strcpy() is deprecated; use strscpy() instead.

No functional changes intended.

Link: https://github.com/KSPP/linux/issues/88


Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20250519105628.491675-1-thorsten.blum@linux.dev


Signed-off-by: Takashi Iwai <tiwai@suse.de>