sdm710-common: Change default GPU idle timeout to 60ms

 * Following Sultan's change: kerneltoast/android_kernel_google_floral@5f8e109

 * Changing powerhint config leaves place for boosting.

Signed-off-by: xNombre <kartapolska@gmail.com>
Change-Id: Ia08086c5748f28113b9fe9f31fdc22f9fc41efca
Signed-off-by: Marco Zanin <mrczn.bb@gmail.com>

configs/powerhint.json

@@ -94,7 +94,7 @@
       "Path": "/sys/class/kgsl/kgsl-3d0/idle_timer",
       "Values": [
         "10000",
-        "80"
+        "60"
       ],
       "ResetOnInit": true
     },