hw/scsi: 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>
Message-Id: <20180625124238.25339-10-f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/scsi/scsi-disk.c

@@ -29,6 +29,7 @@ do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
 #endif
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "hw/scsi/scsi.h"
@@ -44,13 +45,13 @@ do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
 #include <scsi/sg.h>
 #endif
 
-#define SCSI_WRITE_SAME_MAX         524288
-#define SCSI_DMA_BUF_SIZE           131072
+#define SCSI_WRITE_SAME_MAX         (512 * KiB)
+#define SCSI_DMA_BUF_SIZE           (128 * KiB)
 #define SCSI_MAX_INQUIRY_LEN        256
 #define SCSI_MAX_MODE_LEN           256
 
-#define DEFAULT_DISCARD_GRANULARITY 4096
-#define DEFAULT_MAX_UNMAP_SIZE      (1 << 30)   /* 1 GB */
+#define DEFAULT_DISCARD_GRANULARITY (4 * KiB)
+#define DEFAULT_MAX_UNMAP_SIZE      (1 * GiB)
 #define DEFAULT_MAX_IO_SIZE         INT_MAX     /* 2 GB - 1 block */
 
 #define TYPE_SCSI_DISK_BASE         "scsi-disk-base"