Fix the Enhanced Compilation Failure Issue

[bfforever]

What type of PR is this?

/kind bug

What this PR does / why we need it:
Fix the Enhanced Compilation Failure Issue

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
#309
For enhanced kernel, without changing BpfKmesh to pointer type, would report an error pkg/bpf/bpf.go:58:18: cannot use NewBpfKmesh(l.config) (value of type BpfKmesh) as *BpfKmesh value in assignment at kmesh-daemon compile time.

Does this PR introduce a user-facing change?:

[kmesh-bot]

Welcome @bfforever! It looks like this is your first PR to kmesh-net/kmesh 🎉

[hzxuzhonghu]

/ok-to-test

[hzxuzhonghu]

Ensure you have a local copy of your branch by [checking out the pull request locally via command line](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/checking-out-pull-requests-locally).
In your local branch, run: git rebase HEAD~1 --signoff
Force push your changes to overwrite the branch: git push --force-with-lease origin kmesh-issues

[lec-bit]

time="2024-05-10T07:23:33Z" level=info msg="FLAG: --bpf-fs-path="/sys/fs/bpf"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --cgroup2-path="/mnt/kmesh_cgroup2"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --cni-etc-path="/etc/cni/net.d"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --conflist-name=""" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --enable-mda="false"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --help="false"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --mode="workload"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="FLAG: --plugin-cni-chained="true"" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="bpf Start successful" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="service node sidecar10.244.2.6kmesh-vpvg9.kmesh-system~kmesh-system.svc.cluster.local connect to discovery address istiod.istio-system.svc:15012" subsys=controller/config
time="2024-05-10T07:23:33Z" level=info msg="controller Start successful" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="dump StartServer successful" subsys=manager
time="2024-05-10T07:23:33Z" level=info msg="start write CNI config\n" subsys="cni installer"
time="2024-05-10T07:23:33Z" level=info msg="kmesh cni use chained\n" subsys="cni installer"
time="2024-05-10T07:23:36Z" level=info msg="Copied /usr/bin/kmesh-cni to /opt/cni/bin." subsys="cni installer"
time="2024-05-10T07:23:36Z" level=info msg="kubeconfig either does not exist or is out of date, writing a new one" subsys="cni installer"
time="2024-05-10T07:23:36Z" level=info msg="wrote kubeconfig file /etc/cni/net.d/kmesh-cni-kubeconfig" subsys="cni installer"
time="2024-05-10T07:23:36Z" level=info msg="cni config file: /etc/cni/net.d/10-kindnet.conflist" subsys="cni installer"
time="2024-05-10T07:23:36Z" level=info msg="command Start cni successful" subsys=manager

[lec-bit]

Can be compiled and launched normally

[bfforever]

okay，I had followed with your commnds.

[hzxuzhonghu]

Prefer return pointer type

/lgtm

[kmesh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hzxuzhonghu

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hzxuzhonghu]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment