mdss: implement panel color control

Adapted and modified work by CM-10.2, morfic and ktoonsez

Creates a syfs interface here:
/sys/class/lcd/panel/panel_colors

Will accept 0-4 for parameters:
0 - Cold (more blues)
1 - Cool
2 - Normal (stock colors)
3 - Warm
4 - Hot (more reds)
build: fix a symlink issue and remove default gov

this resolves a few possible causes for bootloop
Revert "umbrella_core: don't skip waking up speedchange_task if target_freq > policy->cur"

This reverts commit 6cd5d6eda97bca0f1251f2a162573e6fa815bfb1.
Revert "cpufreq: interactive: don't skip waking up speedchange_task if target_freq > policy->cur"

This reverts commit bc4f57ecb188788782510ff19222378c6d562776.
build: fix a symlink issue and remove default gov