CI: Use a working Linux kernel

That patch is an aggregation from our Gerrit tree, the latest branch.

Change-Id: I0c142c12713550130a0dd2169ffa20bb1159bc75
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index bdffe5a..7c0bf8c 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -23,6 +23,7 @@
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.19"
+BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/patches/linux.patch"
 BR2_LINUX_KERNEL_DEFCONFIG="mvebu_v7"
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/linux.fragment $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/linux.fragment"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y