sunxi: Enable DM_I2C for A64/H3/H5

This commits enable DM I2C support for A64/H3/H5 SoCs.

It is not enabled globaly for all sunxi SoCs, because some boards use
PMICs which are connected through I2C. In order to keep same
functionality, PMIC drivers needs to be ported to DM too.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>