soc: sunxi: sram: Export the LDO control register

Some newer Allwinner SoCs contain internal LDOs managed by a register in
the system control MMIO space. Export this from the regmap in addtion to
the EMAC register.

Use generic names now that the regmap is no longer EMAC-specific.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220815041248.53268-10-samuel@sholland.org


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>