Probe the hwmon chip on the SDN ROADM, too

That driver doesn't support DT at all and (hence that explicit echo),
and its source says that "the BIOS" should initialize the fan connection
thingy explicitly. So here we go, let's pretend that we're the BIOS :).

Change-Id: I660cfd0ba658e5296f01e92933cfc9c94e365ed2
diff --git a/board/czechlight/common/overlay/usr/lib/systemd/system/cla-i2c-adt7463.service b/board/czechlight/common/overlay/usr/lib/systemd/system/cla-i2c-adt7463.service
index 31ddb28..aa07348 100644
--- a/board/czechlight/common/overlay/usr/lib/systemd/system/cla-i2c-adt7463.service
+++ b/board/czechlight/common/overlay/usr/lib/systemd/system/cla-i2c-adt7463.service
@@ -1,6 +1,8 @@
 [Unit]
 Description=Configure the I2C ADT7463 for two-wire fans
 ConditionKernelCommandLine=|czechlight=CL-ROADMv2
+ConditionKernelCommandLine=|czechlight=sdn-roadm-add-drop
+ConditionKernelCommandLine=|czechlight=sdn-roadm-line
 Before=sysrepod.service
 
 [Service]