BitRig/src 31f8719sys/arch/arm64/conf files.arm64 generic.arm64, sys/arch/arm64/dev agmemtimer.c agtimer.c

Agtimer (ARM64 architectural timer) works fine on dragonboard, use it.
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+0-518sys/arch/arm64/dev/agmemtimer.c
+0-4sys/arch/arm64/conf/files.arm64
+2-0sys/arch/arm64/dev/agtimer.c
+0-1sys/arch/arm64/conf/generic.arm64
+2-5234 files

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