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freedreno/devices: Do not write to 8E79 on a750, KGSL has it protected

Danylo Piliaiev requested to merge Danil/mesa:fix/turnip/a750-android-protected-reg-write into main

What does this MR do and why?

freedreno/devices: Do not write to 8E79 on a750, KGSL has it protected

Writing REG_A7XX_RB_UNKNOWN_8E79 causes:

 adreno-gen7-gmu 3d68000.qcom,gmu: CP | Protected mode error | WRITE | addr=0x08e79 | status=0x00608e79

Fixes: ebde7d5e ("tu/a7xx: Write even more magic regs to fix rendering issues on Android")

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