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gpu/arm: midgard: Add sysfs attribute to show gpu utilization

Kidd Chen requested to merge mediatek/aiot/team-mtk-aiot-sw-ss2/linux:kidd/gpu-usage into mtk-v5.15-dev

Calculate current gpu usage by below formula which provided by mali: utilisation = (100 * busy time) /max(total time, 1u) and show the gpu usage by cmd: cat /sys/devices/platform/soc/13000000.mali/gpu_utilization

Edited by Kidd Chen

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