build: Disable Tamil locale

With only 3% approved in CM project and 1% on AOSP project
in the past 5 months, this is a no-go

Change-Id: I0c9d31d5737a2191e9a425b9de98ca659071ad7d
(cherry picked from commit 29a9b31bebda3536f86e197b44c1fa14432a1503)