s390/dasd: Put sub-order definitions in a separate section

There are orders and sub-orders. Put them in different sections for a
better overview.
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/block/dasd_eckd.h

@@ -52,13 +52,17 @@
 #define DASD_ECKD_CCW_RCD		 0xFA
 
 /*
- * Perform Subsystem Function / Sub-Orders
+ * Perform Subsystem Function / Orders
  */
 #define PSF_ORDER_PRSSD			 0x18
 #define PSF_ORDER_CUIR_RESPONSE		 0x1A
-#define PSF_SUBORDER_QHA		 0x1C
 #define PSF_ORDER_SSC			 0x1D
 
+/*
+ * Perform Subsystem Function / Sub-Orders
+ */
+#define PSF_SUBORDER_QHA		 0x1C /* Query Host Access */
+
 /*
  * CUIR response condition codes
  */