rtlwifi: rtl8192cu: replace _rtl92c_evm_db_to_percentage with generic version

Function _rtl92c_evm_db_to_percentage is functionally identical
to the generic version rtl_evm_db_to_percentage, so remove
_rtl92c_evm_db_to_percentage and use the generic version instead.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.c

@@ -577,22 +577,6 @@ static u8 _rtl92c_query_rxpwrpercentage(s8 antpower)
 		return 100 + antpower;
 }
 
-static u8 _rtl92c_evm_db_to_percentage(s8 value)
-{
-	s8 ret_val;
-
-	ret_val = value;
-	if (ret_val >= 0)
-		ret_val = 0;
-	if (ret_val <= -33)
-		ret_val = -33;
-	ret_val = 0 - ret_val;
-	ret_val *= 3;
-	if (ret_val == 99)
-		ret_val = 100;
-	return ret_val;
-}
-
 static long _rtl92c_signal_scale_mapping(struct ieee80211_hw *hw,
 		long currsig)
 {
@@ -743,7 +727,7 @@ static void _rtl92c_query_rxphystatus(struct ieee80211_hw *hw,
 		else
 			max_spatial_stream = 1;
 		for (i = 0; i < max_spatial_stream; i++) {
-			evm = _rtl92c_evm_db_to_percentage(p_drvinfo->rxevm[i]);
+			evm = rtl_evm_db_to_percentage(p_drvinfo->rxevm[i]);
 			if (packet_match_bssid) {
 				if (i == 0)
 					pstats->signalquality =