Fix CPU speed index of 1 being reported when device only has one speed setting
Detail: c/cpuclock - Adjust cpuclock_Get to make sure that a speed index of 0 is reported if the device claims to only support one speed (e.g. Pi 1). Also adjust logic so that any speed higher than the low speed counts as the high speed. Admin: Tested on Pi 1B, 2B, 3B Version 0.04. Tagged as 'BCMSupport-0_04'
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