misc: Remove sim/cur_tick dependency from sim/core.hh

Remove this unnecessary dependency. Fixed all incorrect
includes of sim/core.hh.

Change-Id: I3ae282dbaeb45fbf4630237a3ab9b1a593ffbe0c
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43592
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
72 files changed