bluesleep: Don't wait for uart tx queue to flush

* UART tx queue created rare issues of BT resetting due to some error.
* This patch will help entering lpm faster.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Revert "cpufreq: interactive: Simplify frequency calculations"

This reverts commit dab8fc00db2dbef858e1f441444b8ddff32ea2fe.
cpufreq: interactive: Support variable frequency calculations

Use a threshold value up to which we are evaluating the current
speed weighted by current load against each new choice of speed.
Above switch to the original frequency calculation proportional to
load relative to the max possible frequency which allows for more
dynamic and fair changes.

Default threshold is cpuinfo min which guarantees minimal freqs
and energy usage during (offloaded) media playback.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>