spi: meson-spicc: make symbol 'meson_spicc_pow2_clk_ops' static

The sparse tool complains as follows:

drivers/spi/spi-meson-spicc.c:570:22: warning:
 symbol 'meson_spicc_pow2_clk_ops' was not declared. Should it be static?

This symbol is not used outside of spi-meson-spicc.c, so marks it static.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20220922040807.1409540-1-weiyongjun@huaweicloud.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-meson-spicc.c

@@ -567,7 +567,7 @@ static int meson_spicc_pow2_set_rate(struct clk_hw *hw, unsigned long rate,
 	return clk_divider_ops.set_rate(hw, rate, parent_rate);
 }
 
-const struct clk_ops meson_spicc_pow2_clk_ops = {
+static const struct clk_ops meson_spicc_pow2_clk_ops = {
 	.recalc_rate = meson_spicc_pow2_recalc_rate,
 	.determine_rate = meson_spicc_pow2_determine_rate,
 	.set_rate = meson_spicc_pow2_set_rate,