RAUC: ensure that our hook always runs

Change-Id: I2976bbbe3dfd3cf3192ea266cbf74194d24caab4
Link: https://github.com/rauc/rauc/issues/190
diff --git a/board/czechlight/clearfog/overlay/etc/rauc/system.conf b/board/czechlight/clearfog/overlay/etc/rauc/system.conf
index 8fc94d4..eac1494 100644
--- a/board/czechlight/clearfog/overlay/etc/rauc/system.conf
+++ b/board/czechlight/clearfog/overlay/etc/rauc/system.conf
@@ -14,6 +14,7 @@
 device=/dev/mmcblk0p2
 type=ext4
 parent=rootfs.0
+ignore-checksum=true
 
 [slot.rootfs.1]
 device=/dev/mmcblk0p3
@@ -24,3 +25,4 @@
 device=/dev/mmcblk0p4
 type=ext4
 parent=rootfs.1
+ignore-checksum=true