drm/msm/a6xx: Enable IFPC on A750 GPU

A750 GPU has similar IFPC related configurations like X1-85. Add
the IFPC QUIRK to enable IFPC feature.

Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/673386/


Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>