ASoC: sunxi: sun4i-spdif: Remove redundant of_match_ptr()

The driver depends on CONFIG_OF, it is not necessary to use
of_match_ptr() here.

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20230811071426.2343133-4-ruanjinjie@huawei.com


Signed-off-by: Mark Brown <broonie@kernel.org>