qcacld-3.0: Remove sme_send_he_om_ctrl_*_update() prototypes

The functions sme_send_he_om_ctrl_bw_update() and
sme_send_he_om_ctrl_nss_update() were removed by the following patch:

  qcacld-3.0: Add support to configure HE +HTC support and OMI Tx
  Change-Id Ic3ad5952198472ecda79471a37ff527dfdbcdbf0

However the prototypes were not removed, so remove them now.

Change-Id: I8d3bc19b629d22eb06161dff972388d816b652ab
CRs-Fixed: 3424786

core/sme/inc/sme_api.h

@@ -3261,12 +3261,6 @@ struct omi_ctrl_tx {
 	uint32_t reserved:14;
 };
 
-int sme_send_he_om_ctrl_bw_update(mac_handle_t mac_handle, uint8_t session_id,
-				  uint8_t cfg_val);
-
-int sme_send_he_om_ctrl_nss_update(mac_handle_t mac_handle, uint8_t session_id,
-				   uint8_t cfg_val);
-
 void sme_reset_he_om_ctrl(mac_handle_t mac_handle);
 
 /**