board: xiaomi: mocha: add Xiaomi Mi Pad A0101 support

The Mi Pad is a tablet computer based on Nvidia Tegra K1 SoC which
originally ran the Android operating system. The Mi Pad has a 7.9" IPS
display with 1536 x 2048 (324 ppi) resolution. 2 GB of RAM and 16/64 GB of
internal memory that can be supplemented with a microSDXC card giving up to
128 GB of additional storage.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/doc/board/xiaomi/index.rst b/doc/board/xiaomi/index.rst
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+.. SPDX-License-Identifier: GPL-2.0+
+
+Xiaomi
+======
+
+.. toctree::
+   :maxdepth: 2
+
+   mocha