lakitu_defconfig: enable PCI 8250 serial port support

BUG=b/296276123
TEST=presubmit
RELEASE_NOTE=None

cos-patch: bug
Change-Id: I115803ad365dc79ea0964dc31b119fcdaf74e4ae
Signed-off-by: Oleksandr Tymoshenko <ovt@google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/55330
Reviewed-by: Arnav Kansal <rnv@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
(cherry picked from commit 7ea03d447f9b26b04ff1e04255a3b9ae4d829248)
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/55613
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>