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 <marcan@marcan.st>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210304213902.83903-23-marcan@marcan.st


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>