cros: dts: Add '#' to main snow dts to auto-pick the right kernel FDT

Adding this allows us to use the new CONFIG_FIT_MATCH_ADD_REV feature
to pick the right kernel FDT on snow.

BUG=chrome-os-partner:22585
TEST=On rev3 boot and see rev3 dts picked.
TEST=Hack code to add 2 to revision and see rev5 dts picked.

Change-Id: I466be2f50c24133ba0d47f6f5b9b4414e4532a8b
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/169930
Reviewed-by: Katie Roberts-Hoffman <katierh@chromium.org>
diff --git a/board/samsung/dts/exynos5250-snow.dts b/board/samsung/dts/exynos5250-snow.dts
index 6d01ef2..e5c3e6e 100644
--- a/board/samsung/dts/exynos5250-snow.dts
+++ b/board/samsung/dts/exynos5250-snow.dts
@@ -16,8 +16,8 @@
 /include/ "cros5250-common.dtsi"
 
 / {
-	model = "Google Snow Rev4";
-	compatible = "google,snow-rev4", "google,snow", "google,daisy",
+	model = "Google Snow";
+	compatible = "google,snow-rev#", "google,snow", "google,daisy",
 		   "samsung,smdk5250", "samsung,exynos5250";
 
 	board-rev {