[S390] Add support for IBM zEnterprise 114

Just fix up the Kconfig description and the elf platform.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 18640ff..7b371c3 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -752,6 +752,7 @@
 		strcpy(elf_platform, "z10");
 		break;
 	case 0x2817:
+	case 0x2818:
 		strcpy(elf_platform, "z196");
 		break;
 	}