soc: sunxi: sram: Return void from the release function

There is no point in returning an error here, as the caller can do
nothing about it. In fact, all callers already ignore the return value.

Acked-by: Jernej Skrabec <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jernej Skrabec <[email protected]>

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