Eliminate cpufreq levels for two cases that are less than optimal:

1. Walk the absolute list in reverse to prefer duplicated levels that have
a lower absolute setting, i.e. 800 Mhz/50% is better than 1600 Mhz/25% even
though both have the same actual frequency.  This also removes the need to
check for already-modified levels since by definition, those will be added
later in the sorted list.

2. Compare the absolute settings for derived levels and don't use the new
level if it's higher.  For example, a level of 800 Mhz/75% is preferable to
1600 Mhz/25% even though the latter has a lower total frequency.

This work is based on a patch from the submitter but reworked by myself.

Submitted by:	Tijl Coosemans (tijl/ulyssis.org)

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