ARM: socfpga: Add DDR driver for Arria 10

Add DDR driver support for Arria 10.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
diff --git a/drivers/ddr/altera/Makefile b/drivers/ddr/altera/Makefile
index ec1cb0b..f05314a 100644
--- a/drivers/ddr/altera/Makefile
+++ b/drivers/ddr/altera/Makefile
@@ -8,4 +8,5 @@
 
 ifdef CONFIG_ALTERA_SDRAM
 obj-$(CONFIG_TARGET_SOCFPGA_GEN5) += sdram_gen5.o sequencer.o
+obj-$(CONFIG_TARGET_SOCFPGA_ARRIA10) += sdram_arria10.o
 endif