[ios] Makes sczs@ Infobar OWNER

After the recent Infobar refactoring I think I have enough knowledge to
become an Infobar owner. This will also help on the implementation of the
new design.

Doc: go/bling-infobar-refactoring
CLs: https://crbug.com/892376

Bug: 892376
Change-Id: Idaf4bc27e8ab2f490ad5d93268331616a35a0b71
Reviewed-on: https://chromium-review.googlesource.com/c/1354560Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612475}

ios/chrome/browser/infobars/OWNERS

 rohitrao@chromium.org
+sczs@chromium.org
 
 # TEAM: ios-directory-owners@chromium.org
 # OS: iOS

ios/chrome/browser/ui/infobars/OWNERS

 rohitrao@chromium.org
+sczs@chromium.org
 
 # TEAM: ios-directory-owners@chromium.org
 # OS: iOS