clk: meson: drop meson_aoclk_gate_regmap_ops

let's remove the unused meson_aoclk_gate_regmap_ops

Fixes: 1f932d99 ("clk: meson: remove superseded aoclk_gate_regmap")
Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>