dt-bindings: arm: sunxi: Add Allwinner A100 Perf1 Board bindings

Document board compatible names for Allwinner A100 Perf1 Board.

Signed-off-by: Yangtao Li <frank@allwinnertech.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/0368996b732f300d0b5719e51dbd4322fa09053d.1595572867.git.frank@allwinnertech.com