NO-JIRA: Update owners with all eng members of SPLAT (#166)

**What this PR does / why we need it**:

Update OWNERS adding the whole SPLAT team.

**Which issue(s) this PR fixes** *(optional, use `fixes
#<issue_number>(, fixes #<issue_number>, ...)` format, where
issue_number might be a GitHub issue, or a Jira story*:
Fixes #

**Checklist**
- [ ] Subject and description added to both, commit and PR.
- [ ] Relevant issues have been referenced.
- [ ] This change includes docs. 
- [ ] This change includes unit tests.

Author: mtulio

OWNERS

@@ -1,12 +1,16 @@
+# See the OWNERS docs: https://git.k8s.io/community/contributors/guide/owners.md
+
 reviewers:
 - mtulio
 - rvanderp3
+- vr4manta
 - faermanj
 - jcpowermac
 - jinhli
 
 approvers:
 - mtulio
 - rvanderp3
+- vr4manta
 - faermanj
 - jcpowermac