powerpc/8xxx: Fix quad-rank DIMMs support on corenet_ds board.

The board specific parameters associated with quad rank dimms where
missing.  This fixes it so the board will function if quad rank dimms
are placed in it.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/include/configs/corenet_ds.h b/include/configs/corenet_ds.h
index dd609da..3dcee85 100644
--- a/include/configs/corenet_ds.h
+++ b/include/configs/corenet_ds.h
@@ -124,7 +124,7 @@
 #define CONFIG_SYS_SDRAM_BASE		CONFIG_SYS_DDR_SDRAM_BASE
 
 #define CONFIG_DIMM_SLOTS_PER_CTLR	1
-#define CONFIG_CHIP_SELECTS_PER_CTRL	(2 * CONFIG_DIMM_SLOTS_PER_CTLR)
+#define CONFIG_CHIP_SELECTS_PER_CTRL	(4 * CONFIG_DIMM_SLOTS_PER_CTLR)
 
 #define CONFIG_DDR_SPD
 #define CONFIG_FSL_DDR3