clk: Drop dm.h header file in clk-provider.h

This header file should not be included in other header files. Remove it
and use a forward declaration and un-inlining of dev_get_clk_ptr()
instead.

Fix up the kendryte header files to avoid build errors.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 8a20743..79dce8f 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -9,12 +9,13 @@
 #ifndef __LINUX_CLK_PROVIDER_H
 #define __LINUX_CLK_PROVIDER_H
 
-#include <dm.h>
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <clk-uclass.h>
 #include <linux/err.h>
 
+struct udevice;
+
 static inline void clk_dm(ulong id, struct clk *clk)
 {
 	if (!IS_ERR(clk))
@@ -188,8 +189,5 @@
 const char *clk_hw_get_name(const struct clk *hw);
 ulong clk_generic_get_rate(struct clk *clk);
 
-static inline struct clk *dev_get_clk_ptr(struct udevice *dev)
-{
-	return (struct clk *)dev_get_uclass_priv(dev);
-}
+struct clk *dev_get_clk_ptr(struct udevice *dev);
 #endif /* __LINUX_CLK_PROVIDER_H */