driver/ddr/altera: Add the sdram calibration portion

This patch adds the DDR calibration portion of the Altera SDRAM driver.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
diff --git a/drivers/ddr/altera/Makefile b/drivers/ddr/altera/Makefile
new file mode 100644
index 0000000..1ca7058
--- /dev/null
+++ b/drivers/ddr/altera/Makefile
@@ -0,0 +1,11 @@
+#
+# (C) Copyright 2000-2003
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2010, Thomas Chou <thomas@wytron.com.tw>
+# Copyright (C) 2014 Altera Corporation <www.altera.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_ALTERA_SDRAM) += sdram.o sequencer.o