mali_kbase: platform: dvfs: Add quickstep governor

Adds a new GPU DVFS governor, "quickstep" that clocks up faster
when utilization is considerably higher than the usual threshold
for clocking above a specific level. Skipping a level in this way
is balanced out by reducing stickiness at the new level by halving
the new level's hysteresis value.

Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: Ieb7041dd6a311ac2b32e7bbf033ea09692b09c80