clk: mediatek: add MUX_GATE_FLAGS_2

Add MUX_GATE_FLAGS_2 for the clock which needs to set two falgs.
Such as some mux need to set the flags of "CLK_MUX_ROUND_CLOSEST".

Signed-off-by: chunhui dai <chunhui.dai@mediatek.com>
Signed-off-by: wangyan wang <wangyan.wang@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mediatek/clk-mtk.c

@@ -167,7 +167,7 @@ struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 		mux->mask = BIT(mc->mux_width) - 1;
 		mux->shift = mc->mux_shift;
 		mux->lock = lock;
-
+		mux->flags = mc->mux_flags;
 		mux_hw = &mux->hw;
 		mux_ops = &clk_mux_ops;