msm: kgsl: Enable Limits Management on A640

Limits Management (LM) is now supported on the
A640 GPU, so enable it.

Change-Id: Idd13e8603582f71411b4c77a77e24ee8d13fdf07
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
Signed-off-by: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>