Import Android's dt_table.h for DT image format

Android documentation defines the recommended image format for storing
DTB/DTBO files in a single dtbo.img image. This patch includes the
latest header file with the struct definitions for this format from
AOSP.

The header was adapted to U-Boot's coding style and the function
declarations were removed.

Signed-off-by: Alex Deymo <deymo@google.com>
[trini: Change SDPX tag location]
Signed-off-by: Tom Rini <trini@konsulko.com>

include/dt_table.h

@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * This is from the Android Project,
+ * Repository: https://android.googlesource.com/platform/system/libufdt
+ * File: utils/src/dt_table.h
+ * Commit: 2626d8b9e4d8e8c6cc67ceb1dc4e05a47779785c
+ * Copyright (C) 2017 The Android Open Source Project
+ */
+
+#ifndef DT_TABLE_H
+#define DT_TABLE_H
+
+#include <linux/types.h>
+
+#define DT_TABLE_MAGIC			0xd7b7ab1e
+#define DT_TABLE_DEFAULT_PAGE_SIZE	2048
+#define DT_TABLE_DEFAULT_VERSION	0
+
+struct dt_table_header {
+	u32 magic;		/* DT_TABLE_MAGIC */
+	u32 total_size;		/* includes dt_table_header + all dt_table_entry
+				 * and all dtb/dtbo
+				 */
+	u32 header_size;	/* sizeof(dt_table_header) */
+
+	u32 dt_entry_size;	/* sizeof(dt_table_entry) */
+	u32 dt_entry_count;	/* number of dt_table_entry */
+	u32 dt_entries_offset;	/* offset to the first dt_table_entry
+				 * from head of dt_table_header.
+				 * The value will be equal to header_size if
+				 * no padding is appended
+				 */
+	u32 page_size;		/* flash page size we assume */
+	u32 version;            /* DTBO image version, the current version is 0.
+				 * The version will be incremented when the
+				 * dt_table_header struct is updated.
+				 */
+};
+
+struct dt_table_entry {
+	u32 dt_size;
+	u32 dt_offset;		/* offset from head of dt_table_header */
+
+	u32 id;			/* optional, must be zero if unused */
+	u32 rev;		/* optional, must be zero if unused */
+	u32 custom[4];		/* optional, must be zero if unused */
+};
+
+#endif