rockchip: Add support for veyron-mickey (Chromebit)

This adds support for the Asus Chromebit, and RK3288-based device designed
to plug directly into an HDMI monitor. The device tree file comes from
Linux v4.8.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/google/veyron/Kconfig b/board/google/veyron/Kconfig
index b1f51ce..a99190f 100644
--- a/board/google/veyron/Kconfig
+++ b/board/google/veyron/Kconfig
@@ -13,3 +13,19 @@
 	def_bool y
 
 endif
+
+if TARGET_CHROMEBIT_MICKEY
+
+config SYS_BOARD
+	default "veyron"
+
+config SYS_VENDOR
+	default "google"
+
+config SYS_CONFIG_NAME
+	default "veyron"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif