clearfog: Update U-Boot to v2018.09-rc3

Change-Id: I1295a79eb8a5b57f1baa8d07f8c5ff46fba6fffe
diff --git a/board/czechlight/clearfog/patches/u-boot/boot.patch b/board/czechlight/clearfog/patches/u-boot/boot.patch
index fe3182b..06ac464 100644
--- a/board/czechlight/clearfog/patches/u-boot/boot.patch
+++ b/board/czechlight/clearfog/patches/u-boot/boot.patch
@@ -149,7 +149,7 @@
  {
  	puts("Board: SolidRun ClearFog\n");
 diff --git a/configs/clearfog_defconfig b/configs/clearfog_defconfig
-index 53dbd9fb81..784f56c76e 100644
+index 9167a9450d..faf06cb216 100644
 --- a/configs/clearfog_defconfig
 +++ b/configs/clearfog_defconfig
 @@ -63,3 +63,5 @@ CONFIG_USB=y