x86: sysreset: Move priv/plat structs to headers

With the new of-platdata, these need to be available to dt_platdata.c
so must be in header files. Move them and add the dtd struct too.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/arch/x86/include/asm/sysreset.h b/arch/x86/include/asm/sysreset.h
new file mode 100644
index 0000000..5e586f5
--- /dev/null
+++ b/arch/x86/include/asm/sysreset.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Google LLC
+ */
+#ifndef _X86_ASM_SYSRESET_H_
+#define _X86_ASM_SYSRESET_H_
+
+#include <dt-structs.h>
+
+struct x86_sysreset_plat {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_x86_reset dtplat;
+#endif
+
+	struct udevice *pch;
+};
+
+#endif	/* _X86_ASM_SYSRESET_H_ */