board: asus: transformer: add ASUS Transformer T20 family support

The Asus Eee Pad Transformer family are 2-in-1 detachable/slider
tablets developed by Asus that run the Android operating system.
The Eee Pad Transformers feature a 10.1-inch (260 mm) display,
an Nvidia Tegra 2 dual-core chip, 1 GB of RAM, and 16/32 GB of storage.
Transformers board derives from Nvidia Ventana development board.

This patch brings support for all 3 known T20 Transformers:
- Asus Eee Pad Transformer TF101
- Asus Eee Pad Transformer TF101G
- Asus Eee Pad Slider SL101

Tested-by: Robert Eckelmann <longnoserob@gmail.com> # ASUS TF101
Tested-by: Antoni Aloy Torrens <aaloytorrens@gmail.com> # ASUS TF101
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/board/asus/transformer-t20/Makefile b/board/asus/transformer-t20/Makefile
new file mode 100644
index 0000000..8522f82
--- /dev/null
+++ b/board/asus/transformer-t20/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+#  (C) Copyright 2010,2011
+#  NVIDIA Corporation <www.nvidia.com>
+#
+#  (C) Copyright 2021
+#  Svyatoslav Ryhel <clamor95@gmail.com>
+
+obj-y += transformer-t20.o