powerpc/board: add present2 register definition for QIXIS

According to new QIXIS system definition, update QIXIS registers set
to add present2 register instead of obsolete ctl_sys2.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/board/freescale/common/qixis.h b/board/freescale/common/qixis.h
index 83a3b69..b98b180 100644
--- a/board/freescale/common/qixis.h
+++ b/board/freescale/common/qixis.h
@@ -26,7 +26,7 @@
 	u8 stat_sys;
 	u8 stat_alrm;
 	u8 present;
-	u8 ctl_sys2;
+	u8 present2;    /* Presence Status Register 2,0x0c */
 	u8 rcw_ctl;
 	u8 ctl_led;
 	u8 i2cblk;