s390/kexec: move machine_crash_shutdown() to machine_kexec.c

machine_crash_shutdown() was the only function in crash.c.
So move the function and delete one file.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 86b8247..9a111b6 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -52,7 +52,7 @@
 obj-$(CONFIG_64BIT)		+= cache.o
 
 # Kexec part
-S390_KEXEC_OBJS := machine_kexec.o crash.o
+S390_KEXEC_OBJS := machine_kexec.o
 S390_KEXEC_OBJS += $(if $(CONFIG_64BIT),relocate_kernel64.o,relocate_kernel.o)
 obj-$(CONFIG_KEXEC) += $(S390_KEXEC_OBJS)