dmaengine: xilinx: use strscpy to replace strlcpy

The strlcpy should not be used because it doesn't limit the source
length. Preferred is strscpy.

Signed-off-by: XueBing Chen <chenxuebing@jari.cn>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/39aa840f.e31.181ed9461c2.Coremail.chenxuebing@jari.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>