Revert "sched: Influence cpu_power based on max_freq and efficiency"

This reverts commit 0951ec0f ("sched:
Influence cpu_power based on max_freq and efficiency") to let all cpus
be seen at same 'cpu_power' from load balance perspective. Without
this revert, some cpus will be seen to have more 'cpu_power' than
others, causing tasks to incur wait-time despite availability of idle
cpus. This happens because a cpu with low 'cpu_power' can fail to see
imbalance with another cpu having higher 'cpu_power' and thus can go
idle without pulling any work.

Change-Id: Iccb34319c527d5b45f29c2d12d2ebc7acdd9d07e
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>