platform/x86: intel_scu_ipc: Don't use "proxy" headers

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

Signed-off-by: Andy Shevchenko <[e-mail]>
Acked-by: Mika Westerberg <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Ilpo Järvinen <[e-mail]>
Signed-off-by: Ilpo Järvinen <[e-mail]>

include/linux/platform_data/x86/intel_scu_ipc.h

···
 #ifndef __PLATFORM_X86_INTEL_SCU_IPC_H_
 #define __PLATFORM_X86_INTEL_SCU_IPC_H_
 
+#include <linux/init.h>
 #include <linux/ioport.h>
+#include <linux/types.h>
 
 struct device;
+struct module;
+
 struct intel_scu_ipc_dev;
 
 /**