tests: Add tests for DRAM low power modes

This patch adds two regression tests that execute the script in the
configs dir for triggering low power mode transitions. A separate
test is required for each page policy because for close-adaptive
page policy the DRAM goes into the Precharge Power-down mode while
for open-adaptive page policy it goes into the Activate Power-down
mode.

Change-Id: Iad61af23f132db046f2857cc3ef64b2bf42cf5e4
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5726
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

stats: update references

stats: Add power stats to test references

Change-Id: Ic827213134b199446822f128b81d4a480e777fee

stats: update for snoop filter tweak

stats: update stats to after GPU checkin

stats: bump stats to reflect ruby tester changes

stats: updates due to recent chagnesets

stats: Update stats to match cache changes

stats: Update stats for cache, crossbar and DRAM changes

This update includes the changes to whole-line writes, the refinement
of Read to ReadClean and ReadShared, the introduction of CleanEvict
for snoop-filter tracking, and updates to the DRAM command scheduler
for bank-group-aware scheduling.

Needless to say, almost every regression is affected.

stats: Update stats to reflect cache and interconnect changes

This is a bulk update of stats to match the changes to cache timing,
interconnect timing, and a few minor changes to the o3 CPU.

stats: Bump stats for decoder, TLB, prefetcher and DRAM changes

Changes due to speculative execution of an unaligned PC, introduction
of TLB stats, changes and re-work of the prefetcher, and the
introduction of rank-wise refresh in the DRAM controller.

stats: Add DRAM power statistics to reference output

stats: Bump stats for filter, crossbar and config changes

This patch bumps the stats to reflect the addition of the snoop filter
and snoop stats, the change from bus to crossbar, and the updates to
the ARM regressions that are now using a different CPU and cache
configuration. Lastly, some minor changes are expected due to the
activation cleanup of the CPUs.

stats: Update stats for CPU and cache changes

This patch updates the stats to reflect the fixes and changes to the
CPU (mainly the o3), and the caches.

stats: Bump stats for the fixes, and mostly DRAM controller changes

tests: Reflect name change in DRAM tests

This patch reflects the recent name change in the DRAM TrafficGen
tests and also tidies up the test directory.