storage: scsi: Remove private constants from header

They are used only in the SCSI backend driver so there's no need to
pollute the headers.

src/storage/storage_backend_scsi.c

@@ -40,6 +40,10 @@
 
 VIR_LOG_INIT("storage.storage_backend_scsi");
 
+#define LINUX_SYSFS_SCSI_HOST_PREFIX "/sys/class/scsi_host"
+#define LINUX_SYSFS_SCSI_HOST_POSTFIX "device"
+#define LINUX_SYSFS_SCSI_HOST_SCAN_STRING "- - -"
+
 typedef struct _virStoragePoolFCRefreshInfo virStoragePoolFCRefreshInfo;
 typedef virStoragePoolFCRefreshInfo *virStoragePoolFCRefreshInfoPtr;
 struct _virStoragePoolFCRefreshInfo {

src/storage/storage_backend_scsi.h

@@ -26,10 +26,6 @@
 
 # include "storage_backend.h"
 
-# define LINUX_SYSFS_SCSI_HOST_PREFIX "/sys/class/scsi_host"
-# define LINUX_SYSFS_SCSI_HOST_POSTFIX "device"
-# define LINUX_SYSFS_SCSI_HOST_SCAN_STRING "- - -"
-
 extern virStorageBackend virStorageBackendSCSI;
 
 #endif /* __VIR_STORAGE_BACKEND_SCSI_H__ */