rockchip: rename miniarm to tinker board

Miniarm is the internal project code. Now it is officially named Tinker board.
So rename it.

Signed-off-by: Eddie Cai <eddie.cai@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/rockchip/tinker_rk3288/Makefile b/board/rockchip/tinker_rk3288/Makefile
new file mode 100644
index 0000000..432367f
--- /dev/null
+++ b/board/rockchip/tinker_rk3288/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2016 Rockchip Electronics Co., Ltd
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-y	+= tinker-rk3288.o