tty: serial: samsung_tty: Use devm_ioremap_resource

This picks up the non-posted I/O mode needed for Apple platforms to
work properly.

This removes the request/release functions, which are no longer
necessary, since devm_ioremap_resource takes care of that already. Most
other drivers already do it this way, anyway.

Signed-off-by: Hector Martin <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Tested-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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