s390: use generic shmparam.h header file

Use generic shmparam.h header file since the contents are identical.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/include/asm/shmparam.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- *  S390 version
- *
- *  Derived from "include/asm-i386/shmparam.h"
- */
-#ifndef _ASM_S390_SHMPARAM_H
-#define _ASM_S390_SHMPARAM_H
-
-#define SHMLBA PAGE_SIZE                 /* attach addr a multiple of this */
-
-#endif /* _ASM_S390_SHMPARAM_H */