mali_kbase: platform: dvfs: Implement extensible level locks

Implements a more extensible level locking mechanism that allows for
priority-based determination of what levels DVFS governors can scale
across. Also updated layout of the `clock_info` sysfs node to display
this information.

Bug: 179365671
Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: Ia909ad6883110a632f16e7646bf8b9843dd0c292