Add eholk to Wasm-related OWNERS files

Bug: 
Change-Id: I1ab93d5b2d02d9a4851c2e67d33968a7cafaedd3
Reviewed-on: https://chromium-review.googlesource.com/610892Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47294}

src/trap-handler/OWNERS

 set noparent
 
 bradnelson@chromium.org
+eholk@chromium.org
 
 # Changes to this directory should also be reviewed by:
 #

src/wasm/OWNERS

@@ -5,6 +5,7 @@ bbudge@chromium.org
 bradnelson@chromium.org
 clemensh@chromium.org
 gdeepti@chromium.org
+eholk@chromium.org
 mtrofin@chromium.org
 rossberg@chromium.org
 titzer@chromium.org

test/cctest/wasm/OWNERS

 ahaas@chromium.org
 bradnelson@chromium.org
 clemensh@chromium.org
+eholk@chromium.org
 mtrofin@chromium.org
 rossberg@chromium.org
 titzer@chromium.org

test/mjsunit/wasm/OWNERS

 ahaas@chromium.org
 bradnelson@chromium.org
 clemensh@chromium.org
+eholk@chromium.org
 mtrofin@chromium.org
 rossberg@chromium.org
 titzer@chromium.org

test/unittests/wasm/OWNERS

 ahaas@chromium.org
 bradnelson@chromium.org
 clemensh@chromium.org
+eholk@chromium.org
 mtrofin@chromium.org
 rossberg@chromium.org
 titzer@chromium.org