soc: sunxi: sram: add entry for a523

soc: sunxi: sram: add entry for a523

The A523 has two Ethernet controllers. So in the system controller
address space, there are two registers for Ethernet clock delays,
one for each controller.

Add a new entry for the A523 system controller that allows access to
the second register.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20250908181059.1785605-4-wens@kernel.org
Signed-off-by: Chen-Yu Tsai <wens@csie.org>