msm: kgsl: Enable IFPC on A660 target

Enable IFPC in A660 target features. IFPC stands for
Inter-Frame Power Collapse which is power saving feature.

Change-Id: I13ec90a09df5e974ff2f4c7e989cc49c6f8082f8
Signed-off-by: Nitheesh Muthuraj <nmuthuraj@codeaurora.org>