[AArch64] proc_get_cache_line_size returns incorrect size
On my AArch64 machine, proc_get_cache_line_size
returns 32, whereas cat /sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size
shows 128.
proc_get_cache_line_size needs to be ported to give correct cache line size for AArch64.