Remove Android armv5 targets from 5.1.0 installers

Armv5 is not in releasable quality so it needs to be excluded from
5.1.0 reference installers.

Change-Id: Id255661cc8b35e8050a69221281ccf0adb9512b3
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>