Update kernel to builds 12996908 am: 21000c9c56

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/common-modules/virtual-device/6.6/arm64/+/3473129

Change-Id: Ib302568b029fb1d512d2705b3a289e32a6d20d69
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>