arm: Don't checkpoint the SystemCounter's "_period" value.
arm: Don't checkpoint the SystemCounter's "_period" value.

This value is just a cached inverse of _freq and can be recalculated
easily once the checkpoint is restored. The actual value of _period
actually depends on the global resolution of time (ie how much time a
Tick represents), and so saving the value of _period is also not
technically correct, even though in practice that will very rarely
cause a problem.

Change-Id: I21e63ba25ac4e189417905e532981f3d80723f19
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24390
Reviewed-by: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>
Maintainer: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5