wifi: Fetch the gscan bucket idx from request

We can't rely on the ordering of these buckets to populate their
indexes. So, send them explicitly from the caller.

Bug: 35989680
Test: Compiles
Change-Id: Ife09440935eb3526636c27bfdd40c37c69c7ade2

wifi/1.0/default/hidl_struct_util.cpp

@@ -354,7 +354,10 @@ bool convertHidlGscanParamsToLegacy(
         hidl_scan_params.buckets[bucket_idx];
     legacy_hal::wifi_scan_bucket_spec& legacy_bucket_spec =
         legacy_scan_params->buckets[bucket_idx];
-    legacy_bucket_spec.bucket = bucket_idx;
+    if (hidl_bucket_spec.bucketIdx >= MAX_BUCKETS) {
+      return false;
+    }
+    legacy_bucket_spec.bucket = hidl_bucket_spec.bucketIdx;
     legacy_bucket_spec.band =
         convertHidlWifiBandToLegacy(hidl_bucket_spec.band);
     legacy_bucket_spec.period = hidl_bucket_spec.periodInMs;

wifi/1.0/types.hal

@@ -319,6 +319,11 @@ enum StaScanLimits : uint32_t {
  * scan requests.
  */
 struct StaBackgroundScanBucketParameters {
+  /**
+   * Bucket index. This index is used to report results in
+   * |StaScanData.bucketsScanned|.
+   */
+  uint32_t bucketIdx;
   /**
    * Bands to scan or |BAND_UNSPECIFIED| if frequencies list must be used
    * instead.