Add ssilkin to android/OWNERS

Need someone from video team devs to be in the list. Working on projects
related to Android media codecs for couple of years and have enough
experience to review the changes. A concrete short-term motivation is
the need to land https://webrtc-review.googlesource.com/c/src/+/226867

Bug: none
Change-Id: I1d0a672f6b497bbe1e2d446386284d568f84664a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226951
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34556}
diff --git a/sdk/android/OWNERS b/sdk/android/OWNERS
index 766b798..41ca7b1 100644
--- a/sdk/android/OWNERS
+++ b/sdk/android/OWNERS
@@ -1,6 +1,7 @@
 # New owners
 xalep@webrtc.org
 sartorius@webrtc.org
+ssilkin@webrtc.org
 
 # Legacy owners
 magjed@webrtc.org