mali: dvfs and platform related changes

- let clock to be set to any value
- 5-step modifications
- change 440 and 533 cpu-lock steps
- some other fixes

Conflicts:

	drivers/media/video/samsung/mali/platform/pegasus-m400/mali_platform.c
	drivers/media/video/samsung/mali/platform/pegasus-m400/mali_platform_dvfs.c