arm: dts: sunxi: h3/h5: Add I2S2 node

Add H3/H5 I2S2 node connected to the HDMI interface.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20201030144648.397824-16-peron.clem@gmail.com