clk: mediatek: mux: Clean up included headers

Some included headers aren't actually used anywhere, while other headers
with the declaration of functions and structures aren't directly
included.

Get rid of the unused ones, and add the ones that should be included
directly.

On the header side, replace headers that are included purely for data
structure definitions with forward declarations. This decreases the
amount of preprocessing and compilation effort required for each
inclusion.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Miles Chen <miles.chen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220208124034.414635-12-wenst@chromium.org
Reviewed-by: Chun-Jie Chen <chun-jie.chen@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mediatek/clk-mux.c

@@ -4,13 +4,16 @@
  * Author: Owen Chen <owen.chen@mediatek.com>
  */
 
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/compiler_types.h>
+#include <linux/container_of.h>
+#include <linux/err.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
 
-#include "clk-mtk.h"
 #include "clk-mux.h"
 
 struct mtk_clk_mux {

drivers/clk/mediatek/clk-mux.h

@@ -7,7 +7,13 @@
 #ifndef __DRV_CLK_MTK_MUX_H
 #define __DRV_CLK_MTK_MUX_H
 
-#include <linux/clk-provider.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+struct clk;
+struct clk_onecell_data;
+struct clk_ops;
+struct device_node;
 
 struct mtk_mux {
 	int id;