move: rockchip: move clock drivers into a subdirectory

With the number of Rockchip clock drivers increasing, don't clutter up
the core drivers/clk directory with them and instead move them out of
the way into a separate subdirectory.

Suggested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Simon Glass <sjg@chromium.org>
Updated for rk3399:
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
new file mode 100644
index 0000000..1f8e417
--- /dev/null
+++ b/drivers/clk/rockchip/Makefile
@@ -0,0 +1,9 @@
+#
+# Copyright (c) 2016 Google, Inc
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
+obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
+obj-$(CONFIG_ROCKCHIP_RK3399) += clk_rk3399.o