Add support for read rds group counter extended parameters

This adds new hci command to read rds group counter
extended parameters,receives command complete event
for the same

Change-Id: I6f53fbb1788af1853d01d1f7c6eabbcaff105517
diff --git a/helium/radio-helium-commands.h b/helium/radio-helium-commands.h
index 352017e..da02f52 100644
--- a/helium/radio-helium-commands.h
+++ b/helium/radio-helium-commands.h
@@ -97,6 +97,7 @@
     HCI_FM_HELIUM_AF_JUMP_RSSI_TH,
     HCI_FM_HELIUM_BLEND_SINRHI,
     HCI_FM_HELIUM_BLEND_RMSSIHI,
+    HCI_FM_HELIUM_RDS_GRP_COUNTERS_EXT,
     HCI_FM_HELIUM_AGC_UCCTRL = 0x8000043, /* 0x8000043 */
     HCI_FM_HELIUM_AGC_GAIN_STATE,