soc: sunxi: sram: Prevent the driver from being unbound

This driver exports a regmap tied to the platform device (as opposed to
a syscon, which exports a regmap tied to the OF node). Because of this,
the driver can never be unbound, as that would destroy the regmap. Use
builtin_platform_driver_probe() to enforce this limitation.

Fixes: 5828729bebbb ("soc: sunxi: export a regmap for EMAC clock reg on A64")
Reviewed-by: Jernej Skrabec <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Signed-off-by: Jernej Skrabec <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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