Set big core to group_cfs_skip_mask for sys group by default

Let sys group tasks will run less in big core by default.

Bug: 328210236
Test: build pass
Flag: NONE powerhint change does not support flags
Change-Id: Ic1092af7b22905595be42756112a2959bfcd0b79

powerhint-akita.json

@@ -469,6 +469,15 @@
       ],
       "ResetOnInit": true
     },
+    {
+      "Name": "SysGroupCfsSkipMask",
+      "Path": "/proc/vendor_sched/groups/sys/group_cfs_skip_mask",
+      "Values": [
+        "0x0",
+        "0x100"
+      ],
+      "ResetOnInit": true
+    },
     {
       "Name": "FGPreferIdle",
       "Path": "/proc/vendor_sched/groups/fg/prefer_idle",