ARM/dt: hammerhead: Reduce minimum panel brightness

Default minimum brightness is a tad too high, this change makes reading
in a dark environment much more enjoyable. A value of 3 is still within
the valid range (see lm3630 blmap).

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

Thanks @neobuddy89 never think it's has this set, as i was lazzy to look for it.
FORCE FAST CHARGE: v2.3 added more checks, and code style.

*New checks to thermal mitigation functions and corrected code style.
*Removed updating charging scenario when no charger connected. no point to do so.