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thermal: qoriq: Only enable sites that actually exist

Sebastian Krzyszkowiak requested to merge sebastian.krzyszkowiak/linux-next:thermal into next/byzantium 
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)

Edited by Sebastian Krzyszkowiak

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