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etnaviv: use COARSE clocks to reduce syscalls

Lucas Stach requested to merge lynxeye/mesa:etnaviv-timer-syscalls into main

By using the the COARSE variant of the clock we can avoid a syscall to fetch the current time on platforms where the more accurate version of the clock can not be accelerated through the VDSO. The most relevant platform with this restriction is ARM32 without the architected timer extension, e.g. the NXP i.MX6.

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