powerhint: fix json syntax

JSON syntax stipulates no final comma after the last element in an
object. While Android's parser is not that strict, other tools like
'jq' are unhappy about incorrect syntax.

Fix this up, so that we can use 'jq' to generate the android-mainline
versions of these files in the next step.

Bug: 265961701
Test: jq '."Nodes"[]' powerhint-oriole.json powerhint-raven.json
Fixes: f56bbd1bfbba ("disable vendor idle balancer")
Change-Id: If57e37d63d3a5bdd93552536691a192850198c0b
Signed-off-by: André Draszik <draszik@google.com>
diff --git a/powerhint-oriole.json b/powerhint-oriole.json
index c101230..16800db 100644
--- a/powerhint-oriole.json
+++ b/powerhint-oriole.json
@@ -284,7 +284,7 @@
       "Values": [
         "0",
         "1"
-      ],
+      ]
     },
     {
       "Name": "LimitFlashCurrent",
diff --git a/powerhint-raven.json b/powerhint-raven.json
index 81e01c0..d925b51 100644
--- a/powerhint-raven.json
+++ b/powerhint-raven.json
@@ -283,7 +283,7 @@
       "Values": [
         "0",
         "1"
-      ],
+      ]
     },
     {
       "Name": "LimitFlashCurrent",