CHROMIUM: sched: load balance tunables related to lowres timers

Finch experiment was going on for the last few months with highres
timers disabled and results are generally positive:

124 beta 100%:
https://uma.googleplex.com/p/chrome/variations?sid=a16be03f03c14b440edd235ef6554d93

123 stable 1%:
https://uma.googleplex.com/p/chrome/variations?sid=11f97e0da078a4af95ae7b465c913ee3



Beta has more data as experiment is enabled 100%.

This CL applies the load balancing related tunables for fixes related to low resolution timers. The fixes were gated behind the tunables for the
finch experiments.

This is enabled only for x86 as of now. More verification is needed on arm boards before we rollout this feature on non-x86 boards.

BUG=b:263289152
TEST=boot
Cq-Depend: chromium:5730074
Disallow-Recycled-Builds: all
Change-Id: Iae9923b9af6ae068bfcbd8b66fc9a28c894b7f49
Signed-off-by: Vineeth Pillai <vineethrp@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5640456


Reviewed-by: Joel Fernandes <joelaf@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5813730


Tested-by: Joel Fernandes <joelaf@google.com>
Commit-Queue: Joel Fernandes <joelaf@google.com>
Signed-off-by: Hubert Mazur <hmazur@google.com>