ARM: tegra: Add support for nyan-big board

Nyan-big is a Tegra124 clamshell board that is very similar to venice2, but
it has a different panel, the sdcard cd and wp sense are flipped, and it has
a different revision of the AS3722 PMIC.

This is the Acer Chromebook 13 CB5-311-T7NN (13.3-inch HD, NVIDIA
Tegra K1, 2GB). The display is not currently supported, so it should
boot on other nyan-based Chromebooks also, but only the device tree for
nyan-big is provided here.

The device tree file is from Linux but with features removed which are
unlikely to be supported in U-Boot soon (regulators, pinmux). Also the
addresses are updated to 32-bit.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
(rebase, change to 'nyan-big', fix pinmux that resets nyan-big)
diff --git a/board/nvidia/nyan-big/MAINTAINERS b/board/nvidia/nyan-big/MAINTAINERS
new file mode 100644
index 0000000..ff74627
--- /dev/null
+++ b/board/nvidia/nyan-big/MAINTAINERS
@@ -0,0 +1,6 @@
+NORRIN BOARD
+M:	Allen Martin <amartin@nvidia.com>
+S:	Maintained
+F:	board/nvidia/nyan-big/
+F:	include/configs/nyan-big.h
+F:	configs/nyan-big_defconfig