arch,sim: Make copyStringArray take an explicit endianness.

arch,sim: Make copyStringArray take an explicit endianness.

Change-Id: I5cf4291b19dd2d2bdbbf145ad8e00994fabf5547
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22366
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>