hw/s390x: Use the IEC binary prefix definitions

It eases code review, unit is explicit.

Patch generated using:

  $ git grep -E '(1024|2048|4096|8192|(<<|>>).?(10|20|30))' hw/ include/hw/

and modified manually.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Acked-by: NCornelia Huck <cohuck@redhat.com>
Message-Id: <20180625124238.25339-20-f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/s390x/s390-skeys.c

@@ -10,6 +10,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "hw/boards.h"
 #include "hw/s390x/storage-keys.h"
 #include "qapi/error.h"
@@ -19,7 +20,7 @@
 #include "sysemu/kvm.h"
 #include "migration/register.h"
 
-#define S390_SKEYS_BUFFER_SIZE 131072  /* Room for 128k storage keys */
+#define S390_SKEYS_BUFFER_SIZE (128 * KiB)  /* Room for 128k storage keys */
 #define S390_SKEYS_SAVE_FLAG_EOS 0x01
 #define S390_SKEYS_SAVE_FLAG_SKEYS 0x02
 #define S390_SKEYS_SAVE_FLAG_ERROR 0x04

hw/s390x/s390-stattrib.c

@@ -10,6 +10,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "hw/boards.h"
 #include "cpu.h"
 #include "migration/qemu-file.h"
@@ -20,7 +21,7 @@
 #include "qapi/error.h"
 #include "qapi/qmp/qdict.h"
 
-#define CMMA_BLOCK_SIZE  (1 << 10)
+#define CMMA_BLOCK_SIZE  (1 * KiB)
 
 #define STATTR_FLAG_EOS     0x01ULL
 #define STATTR_FLAG_MORE    0x02ULL

hw/s390x/sclp.c

@@ -13,6 +13,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "qapi/error.h"
 #include "cpu.h"
 #include "sysemu/sysemu.h"
@@ -289,7 +290,7 @@ static void sclp_realize(DeviceState *dev, Error **errp)
     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
     if (ret == -E2BIG) {
         error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
-                   hw_limit >> 30);
+                   hw_limit / GiB);
     } else if (ret) {
         error_setg(&err, "setting the guest size failed");
     }