soc: sunxi: Add the A13, A23 and H3 system control compatibles

The A13, A23 and H3 have variations of the system controls, in part due to
the SRAM that are available (and can be mapped) in the SoC.

In order to make it future proof, let's add compatibles for these SoCs in
the driver.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>