[VOL-2694] Use package specific logger instance in all log statements

Change-Id: Iaab59e919c0576e0143c1d9e0facbd2e63f96e1e
diff --git a/internal/pkg/core/olt_platform.go b/internal/pkg/core/olt_platform.go
index 6b0610c..0c2c777 100644
--- a/internal/pkg/core/olt_platform.go
+++ b/internal/pkg/core/olt_platform.go
@@ -126,7 +126,7 @@
 func MkUniPortNum(intfID, onuID, uniID uint32) uint32 {
 	var limit = int(onuID)
 	if limit > MaxOnusPerPon {
-		log.Warn("Warning: exceeded the MAX ONUS per PON")
+		logger.Warn("Warning: exceeded the MAX ONUS per PON")
 	}
 	return (intfID << (bitsForUniID + bitsForONUID)) | (onuID << bitsForUniID) | uniID
 }
@@ -171,7 +171,7 @@
 //IntfIDFromNniPortNum returns Intf ID derived from portNum
 func IntfIDFromNniPortNum(portNum uint32) (uint32, error) {
 	if portNum < minNniIntPortNum || portNum > maxNniPortNum {
-		log.Errorw("NNIPortNumber is not in valid range", log.Fields{"portNum": portNum})
+		logger.Errorw("NNIPortNumber is not in valid range", log.Fields{"portNum": portNum})
 		return uint32(0), olterrors.ErrInvalidPortRange
 	}
 	return (portNum & 0xFFFF), nil
@@ -269,7 +269,7 @@
 	onuID = OnuIDFromUniPortNum(uniPortNo)
 	uniID = UniIDFromPortNum(uniPortNo)
 
-	log.Debugw("flow extract info result",
+	logger.Debugw("flow extract info result",
 		log.Fields{"uniPortNo": uniPortNo, "ponIntf": ponIntf,
 			"onuID": onuID, "uniID": uniID, "inPort": inPort, "ethType": ethType})