s390x: Fix library constant definitions

Seems like I uppercased the whole region instead of only the ULs when
I added those definitions. Let's make the x lowercase again.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20200429143518.1360468-11-frankja@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index 15a4d49..1b3bb0c 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -19,10 +19,10 @@
 #define PSW_MASK_DAT			0x0400000000000000UL
 #define PSW_MASK_PSTATE			0x0001000000000000UL
 
-#define CR0_EXTM_SCLP			0X0000000000000200UL
-#define CR0_EXTM_EXTC			0X0000000000002000UL
-#define CR0_EXTM_EMGC			0X0000000000004000UL
-#define CR0_EXTM_MASK			0X0000000000006200UL
+#define CR0_EXTM_SCLP			0x0000000000000200UL
+#define CR0_EXTM_EXTC			0x0000000000002000UL
+#define CR0_EXTM_EMGC			0x0000000000004000UL
+#define CR0_EXTM_MASK			0x0000000000006200UL
 
 struct lowcore {
 	uint8_t		pad_0x0000[0x0080 - 0x0000];	/* 0x0000 */