lakitu: switch kdump kernel to Linux 5.10

- Upgrade sys-kernel/dump-capture-kernel to the same version
  as lakitu-kernel-5_10.

- Change ebuild file so it doesn't use cros-kernel2 configure routine
  to avoid bringing in fragments enabled globally through USE flags

- New config was obtained by using [1] as a base and adding missing
  options to make dump kernel functional.

[1] https://prodkernel.git.corp.google.com/tools/gbuild/+/refs/heads/master/gbuild/configs/kdump/

BUG=b/162505450, b/156258044
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I68992a77fdf371dad06f6ffaada88b1e5d8ce605
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/15230
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Roy Yang <royyang@google.com>
6 files changed