Automatic merge from submit-queue (batch tested with PRs 62244, 63685). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
GCE: Add Patch method to GA Backend Services
**What this PR does / why we need it**:
Generates the Patch API call for GA Backend Services.
**Special notes for your reviewer**:
/cc @rramkumar1
**Release note**:
```release-note
NONE
```
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