wifi: Gscan struct conversion changes

Rename |Scan| to |Gscan| because that is the naming we've been using in
WifiLegacyHal.
Also group all the gscan related sturct conversion methods.

Bug: 31991459
Test: Compiles
Change-Id: Ie64bcc032a0058b5b20d0bb701020cdf7bf08890
diff --git a/wifi/1.0/default/hidl_struct_util.h b/wifi/1.0/default/hidl_struct_util.h
index 8729265..f90590b 100644
--- a/wifi/1.0/default/hidl_struct_util.h
+++ b/wifi/1.0/default/hidl_struct_util.h
@@ -54,20 +54,21 @@
 bool convertLegacyApfCapabilitiesToHidl(
     const legacy_hal::PacketFilterCapabilities& legacy_caps,
     StaApfPacketFilterCapabilities* hidl_caps);
-bool convertLegacyScanCapabilitiesToHidl(
+bool convertLegacyGscanCapabilitiesToHidl(
     const legacy_hal::wifi_gscan_capabilities& legacy_caps,
     StaBackgroundScanCapabilities* hidl_caps);
-bool convertHidlScanParamsToLegacy(
+legacy_hal::wifi_band convertHidlGscanBandToLegacy(StaBackgroundScanBand band);
+bool convertHidlGscanParamsToLegacy(
     const StaBackgroundScanParameters& hidl_scan_params,
     legacy_hal::wifi_scan_cmd_params* legacy_scan_params);
 // |has_ie_data| indicates whether or not the wifi_scan_result includes 802.11
 // Information Elements (IEs)
-bool convertLegacyScanResultToHidl(
+bool convertLegacyGscanResultToHidl(
     const legacy_hal::wifi_scan_result& legacy_scan_result,
     bool has_ie_data,
     StaScanResult* hidl_scan_result);
 // |cached_results| is assumed to not include IEs.
-bool convertLegacyVectorOfCachedScanResultsToHidl(
+bool convertLegacyVectorOfCachedGscanResultsToHidl(
     const std::vector<legacy_hal::wifi_cached_scan_results>&
         legacy_cached_scan_results,
     std::vector<StaScanData>* hidl_scan_datas);