Samples should run on a board if they have the peripheral connected, in
this case, if any LED on the board is connected to a PWM output. A
shield could be used to demonstrate a sample on a board that doesn't
have the required peripheral. In this case, it was also unclear where
that "external LED" had to be connected, unless one checks where channel
1 for PWM1 is routed to. All board LEDs are connected to pins that
cannot be driven by PWM.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
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