Remove vishwath@google.com from core/java/android/service/trust/OWNERS

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memberships and affiliations.
If this change is unnecessary or in error, vote CR -1 and the bot
will abandon it. Vote CR +1/2 to approve this change.

See the owner's recent activity for context:
https://googleplex-android-review.googlesource.com/q/vishwath@google.com

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Change-Id: I04bc057e8c917d76a0c5883c909e02aac3b5b9ad
Merged-In: I04bc057e8c917d76a0c5883c909e02aac3b5b9ad
(cherry picked from commit 2636d2af)