media: replace strncpy() by strscpy()

The strncpy() function is being deprecated upstream. Replace
it by the safer strscpy().

While here, replace a few occurences of strlcpy() that were
recently added to also use strscpy().

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/am437x/am437x-vpfe.c

@@ -1540,7 +1540,7 @@ static int vpfe_enum_fmt(struct file *file, void  *priv,
 	if (!fmt)
 		return -EINVAL;
 
-	strncpy(f->description, fmt->name, sizeof(f->description) - 1);
+	strscpy(f->description, fmt->name, sizeof(f->description));
 	f->pixelformat = fmt->fourcc;
 	f->type = vpfe->fmt.type;