Add kswapd experiment.

See go/pixel-perf-25q1-experiments for the info.

Bug: 365855872
Test: build/flash, set .Perf__experiments_delay_seconds=0, set .Perf__kswapd_experiment=true, observe /sys/kernel/vendor_mm/kswapd_cpu_affinity changes
Flag: NONE controlled by Mendel instead
Change-Id: Id63690f0dcd38de92e4c2fde5b0ab814ed3d9db1
Signed-off-by: Dmitry Skiba <dskiba@google.com>
diff --git a/performance/experiments/experiments.mk b/performance/experiments/experiments.mk
index b52d0e6..191332d 100644
--- a/performance/experiments/experiments.mk
+++ b/performance/experiments/experiments.mk
@@ -1,3 +1,5 @@
 BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/performance/experiments/sepolicy
 
 PRODUCT_PACKAGES += pixel-experiments-recovery.sh
+
+include device/google/gs-common/performance/experiments/kswapd/kswapd.mk