Add android's DTB/DTBO partitions format

Documentation: https://source.android.com/devices/architecture/dto/partitions
Reference implementation: https://android.googlesource.com/platform/system/libufdt/+/refs/heads/master/utils/

archive/dto.ksy

@@ -0,0 +1,52 @@
+meta:
+  id: dto
+  title: DTB/DTBO
+  license: CC0-1.0
+  file-extension: img
+  endian: be
+doc-ref: https://source.android.com/devices/architecture/dto/partitions
+types:
+  header:
+    seq:
+    - id: magic
+      contents: [ 0xd7, 0xb7, 0xab, 0x1e ]
+    - id: total_size
+      type: u4
+    - id: header_size
+      type: u4
+    - id: dt_entry_size
+      type: u4
+    - id: dt_entry_count
+      type: u4
+    - id: dt_entries_offset
+      type: u4
+    - id: page_size
+      type: u4
+    - id: version
+      type: u4
+  entry:
+    seq:
+    - id: size
+      type: u4
+    - id: offset
+      type: u4
+    - id: id
+      type: u4
+    - id: rev
+      type: u4
+    - id: custom
+      type: u4
+      repeat: expr
+      repeat-expr: 4
+    instances:
+      body:
+        io: _root._io
+        pos: offset
+        size: size
+seq:
+  - id: header
+    type: header
+  - id: entries
+    type: entry
+    repeat: expr
+    repeat-expr: header.dt_entry_count