[S390] Move memory detection code to own file.
Move memory detection code to own file and also simplify it. Also add an interface which can be called at any time to get the current memory layout. This interface is needed by our kernel internal system dumper. Cc: Peter Oberparleiter <email@example.com> Cc: Michael Holzheu <firstname.lastname@example.org> Cc: Frank Munzert <email@example.com> Signed-off-by: Heiko Carstens <firstname.lastname@example.org> Signed-off-by: Martin Schwidefsky <email@example.com>
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