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gpu: Add gpu3DDefault clock sysfs entry, cleanup GPU clock control behavior

Jonas Höppner requested to merge gpu3d_clock_sysfs into linux-5.10.52-seco

The previous implementation had issues when changing the requested clock values during thermal throtteling. To clean this up there are now three entries in the sysfs:

  • gpu3DClockScale Readonly, giving the current clock ratio

  • gpu3DDefaultClock Clock speed used in normal mode, 64/64 is the default

  • gpu3DMinClock Clock speed used in high temperature mode, 1/64 is the default

Writing to gpu3DDefaultClock and gpu3DMinClock can be used to modify the clock. If the GPU is in the related mode, the clock change directly affects the GPU clock.

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