Add bbudge@ and gdeepti@ to src/codegen OWNERS

Change-Id: Ibc2d7a32bfd91e1db48735bbf49f86957cfbff11
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1680423Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62465}

src/codegen/OWNERS

+bbudge@chromium.org
 bmeurer@chromium.org
 clemensh@chromium.org
+gdeepti@chromium.org
 ishell@chromium.org
 jarin@chromium.org
 jgruber@chromium.org