lakitu: Enable CONFIG_SCHED_CORE in Linux kernel.

This option permits Core Scheduling, a means of coordinated task selection across SMT siblings. When enabled task selection ensures that all SMT siblings will execute a task from the same 'core group', forcing idle when no matching task is found.
Use of this feature includes:
  - mitigation of some (not all) SMT side channels;
  - limiting SMT interference to improve determinism and/or performance.

BUG=b/240497638
TEST=presubmit
RELEASE_NOTE=Enabled CONFIG_SCHED_CORE in the kernel config.

Signed-off-by: Adin Scannell <ascannell@google.com>
Change-Id: I7a921a44175c36a6a959f7755f1155dc6a23d013
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/35331
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Meena Shanmugam <meenashanmugam@google.com>

arch/arm64/configs/lakitu_defconfig

diff --git a/arch/arm64/configs/lakitu_defconfig b/arch/arm64/configs/lakitu_defconfig
index d56eeb0..5763c47 100644
--- a/arch/arm64/configs/lakitu_defconfig
+++ b/arch/arm64/configs/lakitu_defconfig
@@ -101,7 +101,7 @@
 CONFIG_PREEMPT_NONE=y
 # CONFIG_PREEMPT_VOLUNTARY is not set
 # CONFIG_PREEMPT is not set
-# CONFIG_SCHED_CORE is not set
+CONFIG_SCHED_CORE=y
 
 #
 # CPU/Task time and stats accounting

arch/x86/configs/lakitu_defconfig

diff --git a/arch/x86/configs/lakitu_defconfig b/arch/x86/configs/lakitu_defconfig
index 9903822..1301a0c 100644
--- a/arch/x86/configs/lakitu_defconfig
+++ b/arch/x86/configs/lakitu_defconfig
@@ -121,7 +121,7 @@
 CONFIG_PREEMPT_NONE=y
 # CONFIG_PREEMPT_VOLUNTARY is not set
 # CONFIG_PREEMPT is not set
-# CONFIG_SCHED_CORE is not set
+CONFIG_SCHED_CORE=y
 
 #
 # CPU/Task time and stats accounting