mfd: davinci_voicecodec: Don't use "proxy" headers

Update header inclusions to follow IWYU (Include What You Use)
principle.

Note that kernel.h is discouraged to be included as it's written
at the top of that file.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: andy-shev

include/linux/mfd/davinci_voicecodec.h

@@ -10,11 +10,13 @@
 #ifndef __LINUX_MFD_DAVINCI_VOICECODEC_H_
 #define __LINUX_MFD_DAVINCI_VOICECODEC_H_
 
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
+#include <linux/bits.h>
 #include <linux/mfd/core.h>
-#include <linux/platform_data/edma.h>
+#include <linux/types.h>
 
+struct clk;
+struct device;
+struct platform_device;
 struct regmap;
 
 /*