OWNERS: Transfer Enhancements subproject ownership to SIG Arch

We also use this opportunity to simplify the OWNERS aliases now that
ownership of certain directories is no longer shared across multiple
SIGs.

Signed-off-by: Stephen Augustus <[email protected]>

Author: justaugustus

Diff for: OWNERS

@@ -1,12 +1,9 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  - pm-maintainers
-  - sig-pm-leads
+  - enhancements-approvers
+  - sig-architecture-leads
 reviewers:
-  - features-maintainers
-  - kep-process-approvers
-  - kep-process-reviewers
-  - sig-release-leads
+  - enhancements-reviewers
 labels:
-  - sig/pm
+  - sig/architecture

Diff for: OWNERS_ALIASES

@@ -164,36 +164,13 @@ aliases:
     - spiffxp
     - timothysc
 ## BEGIN CUSTOM CONTENT
-  pm-maintainers:
-    - calebamiles # SIG PM Chair
-    - idvoretskyi # SIG PM Chair
-    - jdumars # SIG PM Chair
-    - justaugustus # SIG PM Chair
-  features-maintainers:
-    - justaugustus # 1.12 Features Lead
-    - claurence # 1.14 Enhancements Lead
-    - kacole2 # 1.15 / 1.13 Enhancements Lead
-  kep-process-approvers:
+  enhancements-approvers:
     - calebamiles
     - idvoretskyi
     - jdumars
     - justaugustus
-  kep-process-reviewers:
+  enhancements-reviewers:
     - lachie83
-  kep-reviewers:
-    - bgrant0607
-    - derekwaynecarr
-    - dims
-    - jbeda
-    - jdumars
-    - mattfarina
-  kep-approvers:
-    - bgrant0607
-    - derekwaynecarr
-    - dims
-    - jbeda
-    - jdumars
-    - mattfarina
   provider-aws:
     - d-nishi
     - justinsb

Diff for: keps/OWNERS

@@ -1,12 +1,8 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  - kep-approvers
-  - kep-process-approvers
+  - enhancements-approvers
 reviewers:
-  - kep-reviewers
-  - kep-process-reviewers
+  - enhancements-reviewers
 labels:
   - kind/kep
-options:
-  no_parent_owners: true