dm: implement a Timer uclass

Implement a Timer uclass to work with lib/time.c.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
new file mode 100644
index 0000000..afb0009
--- /dev/null
+++ b/drivers/timer/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_TIMER)		+= timer-uclass.o