On i.MX8MQ, enabling monitoring sites that aren't connected to anything
can cause unwanted side effects on some units. This seems to happen
once some of these sites report out-of-range readings and results in
sensor misbehavior, such as thermal zone readings getting stuck or even
suddenly reporting an impossibly high value, triggering emergency
shutdowns.
The datasheet lists all non-existent sites as "reserved" and doesn't
make any guarantees about being able to enable them at all, so let's
not do that.
Fixes: 45038e03d633 ("thermal: qoriq: Enable all sensors before registering them")
Fixes #275 (closed)