msm: kgsl: make msm-adreno-tz the default governor for adreno

On targets where trustzone is available, use the trustzone
based governor instead of simple_ondemand.

Change-Id: Ie11c57684fc63a26e82a5c4816a35a327a1bf945
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: Vladimir Razgulin <vrazguli@codeaurora.org>