FM: Avoid interferece during WAN and Fm Coex.

Changes are made to avoid interferece seen during WAN
and Fm co-ex tests, With this change FM does keep track of
WAN status such that it would enable LPF to avoid interference

Change-Id: I015cd8b3fa074c4b7b90827a1fe619d44433323b
diff --git a/helium/radio-helium-commands.h b/helium/radio-helium-commands.h
index da02f52..c5dfba9 100644
--- a/helium/radio-helium-commands.h
+++ b/helium/radio-helium-commands.h
@@ -100,6 +100,7 @@
     HCI_FM_HELIUM_RDS_GRP_COUNTERS_EXT,
     HCI_FM_HELIUM_AGC_UCCTRL = 0x8000043, /* 0x8000043 */
     HCI_FM_HELIUM_AGC_GAIN_STATE,
+    HCI_FM_HELIUM_ENABLE_LPF,
 
     /*using private CIDs under userclass*/
     HCI_FM_HELIUM_READ_DEFAULT = 0x00980928,