powerpc/mpc8xxx: Add 16-bit support for DDR3

Add support for 16-bit DDR bus. Also deal with system using 64- and 32-bit
DDR devices.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/options.c b/arch/powerpc/cpu/mpc8xxx/ddr/options.c
index 80c7046..02efe58 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/options.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/options.c
@@ -438,7 +438,8 @@
 	popts->OTF_burst_chop_en = 0;	/* on-the-fly burst chop disable */
 	popts->burst_length = DDR_BL8;	/* Fixed 8-beat burst len */
 #else
-	if (popts->data_bus_width == 1) {	/* 32-bit bus */
+	if ((popts->data_bus_width == 1) || (popts->data_bus_width == 2)) {
+		/* 32-bit or 16-bit bus */
 		popts->OTF_burst_chop_en = 0;
 		popts->burst_length = DDR_BL8;
 	} else {