[S390] add MACHINE_IS_LPAR flag

Introduce the MACHINE_IS_LPAR flag for code that should only be
executed if Linux is running in an LPAR.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 8d8957b..d9fb98c 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -804,7 +804,7 @@
 	if (MACHINE_IS_VM)
 		pr_info("Linux is running as a z/VM "
 			"guest operating system in 31-bit mode\n");
-	else
+	else if (MACHINE_IS_LPAR)
 		pr_info("Linux is running natively in 31-bit mode\n");
 	if (MACHINE_HAS_IEEE)
 		pr_info("The hardware system has IEEE compatible "
@@ -818,7 +818,7 @@
 			"guest operating system in 64-bit mode\n");
 	else if (MACHINE_IS_KVM)
 		pr_info("Linux is running under KVM in 64-bit mode\n");
-	else
+	else if (MACHINE_IS_LPAR)
 		pr_info("Linux is running natively in 64-bit mode\n");
 #endif /* CONFIG_64BIT */