thermal/of: Fix cdev lookup in thermal_of_should_bind()

Since thermal_of_should_bind() terminates the loop after processing
the first child found in cooling-maps, it will never match more than
one cdev to a given trip point which is incorrect, as there may be
cooling-maps associating one trip point with multiple cooling devices.

Address this by letting the loop continue until either all
children have been processed or a matching one has been found.

To avoid adding conditionals or goto statements, put the loop in
question into a separate function and make that function return
right away after finding a matching cooling-maps entry.

Fixes: 94c6110b0b13 ("thermal/of: Use the .should_bind() thermal zone callback")
Link: https://lore.kernel.org/linux-pm/[email protected]/
Reported-by: Yu-Che Cheng <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Reviewed-by: Yu-Che Cheng <[email protected]>
Tested-by: Yu-Che Cheng <[email protected]>
Reviewed-by: Lukasz Luba <[email protected]>
Tested-by: Lukasz Luba <[email protected]>
Link: https://patch.msgid.link/[email protected]

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