kexec/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types

In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that
performs proper zero and sign extension convert all 64 bit parameters
to their corresponding 32 bit compat counterparts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

diff --cc include/linux/compat.h
Simple merge

diff --cc include/linux/kexec.h
Simple merge

diff --cc kernel/kexec.c
Simple merge