rockchip: add support for rk3288 PopMetal board

PopMetal is a rockchip rk3288 based board made by ChipSpark, which has
many interface such as HDMI, VGA, USB, micro-SD card, WiFi, Audio and
Gigabit Ethernet.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/board/chipspark/popmetal_rk3288/MAINTAINERS b/board/chipspark/popmetal_rk3288/MAINTAINERS
new file mode 100644
index 0000000..1a6a1bb
--- /dev/null
+++ b/board/chipspark/popmetal_rk3288/MAINTAINERS
@@ -0,0 +1,6 @@
+POPMETAL-RK3288
+M:	Lin Huang <hl@rock-chips.com>
+S:	Maintained
+F:	board/chipspark/popmetal_rk3288
+F:	include/configs/popmetal_rk3288.h
+F:	configs/popmetal-rk3288_defconfig