qcacld-3.0: Remove wma roam event prototypes

Functions wma_roam_synch_event_handler() and wma_roam_event_callback()
were removed by:
  qcacld-3.0: Cleanup ROAM_TARGET_IF_CONVERGENCE usage
  Change-Id I6973d9c366ec6a9c6164dd19f6f4775dd3ebf5f0

However, the prototypes were left behind, so remove them now.

Change-Id: I53970271698425093abd3d96f8c03b8eef0bbb60
CRs-Fixed: 3434498

core/wma/inc/wma_internal.h

@@ -172,9 +172,6 @@ QDF_STATUS wma_set_ppsconfig(uint8_t vdev_id, uint16_t pps_param,
  */
 
 #ifdef WLAN_FEATURE_ROAM_OFFLOAD
-int wma_roam_synch_event_handler(void *handle, uint8_t *event,
-					uint32_t len);
-
 /**
  * wma_register_roam_vdev_disc_event_handler() - API to register handler for
  * roam vdev disconnect event id
@@ -509,9 +506,6 @@ QDF_STATUS wma_scan_probe_setoui(tp_wma_handle wma,
 
 void wma_roam_better_ap_handler(tp_wma_handle wma, uint32_t vdev_id);
 
-int wma_roam_event_callback(WMA_HANDLE handle, uint8_t *event_buf,
-			    uint32_t len);
-
 /*
  * wma_dev_if.c functions declarations
  */