spi: uniphier: switch to use modern name

Change legacy name master to modern name host or controller.

No functional changed.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://msgid.link/r/20231128093031.3707034-19-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Yang Yingliang