arch-arm,misc: Add M5_CLASS_VAR_USED to faultTick

Clang compilers returned an error that faultTick was unused. Adding
M5_CLASS_VAR_USED resolves this.

Change-Id: I97657b45997d2f1c7416b973cd9c02ae2d92b725
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29453
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed