board: starfive: add StarFive VisionFive v2 board support

Add board support for StarFive VisionFive v2.

Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
diff --git a/doc/board/starfive/index.rst b/doc/board/starfive/index.rst
new file mode 100644
index 0000000..0c52dc7
--- /dev/null
+++ b/doc/board/starfive/index.rst
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+.. SPDX-License-Identifier: GPL-2.0+
+
+StarFive
+========
+
+.. toctree::
+   :maxdepth: 1
+
+   visionfive2